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4[[quoteright:300:[[VideoGame/FableII https://static.tvtropes.org/pmwiki/pub/images/Fable_2_Cover_Art_No_text_5914.jpg]]]]
5
6->''"He who fights monsters should see to it that he himself does not become a monster. And if you gaze for long into an abyss, the abyss gazes also into you."''
7-->— '''Creator/FriedrichNietzsche''', ''Beyond Good and Evil''
8%%
9%% One quote is sufficient. For additional entries, please use the quotes tab.
10
11''...will become no better than the monsters he slays.''
12
13Something has happened to our FallenHero: his [[DoomedHometown village was destroyed]], [[EverybodysDeadDave his friends were killed]], [[AndYourLittleDogToo his puppy was roasted on an open spit]], [[ArsonMurderAndJaywalking his bike was stolen]], whatever. All that matters is that ItsPersonal, and he feels that the law just isn't suitable enough (or has become [[BadCopIncompetentCop too corrupt and ignorant]]) to be of any use to him in settling the matter. He may justify his actions by claiming that it's [[KnightTemplar justice he's after, not vengeance]], but anyone with half a brain can easily see that he's out for {{revenge}}. Unfortunately, we can also see that the more he hunts the cause of his woes, [[FaceHeelTurn the more he takes on]] [[MirrorCharacter the villain's personality and mannerisms]] -- something that our [[{{Hypocrite}} so-called hero]] is too blinded by his single-minded goal to realize.
14
15He Who Fights Monsters is [[AntiVillain not quite a villain]], but they act antagonistically enough that [[AntiHero they're little better than a villain]]. He may have [[WellIntentionedExtremist good intentions]]; he might have a point when he says that the fiend is too dangerous to be kept alive. Other characters within the work itself [[JerkassHasAPoint might even concede that point]]. But ultimately, his [[AmbitionIsEvil obsession]] with dealing out [[PayEvilUntoEvil due punishment]] ([[DisproportionateRetribution or worse]]) and his refusal to think about what he's doing twists him into a monster [[ThisIsYourBrainOnEvil just as bad as, or even worse than, the one he's hunting]]. And [[MoralEventHorizon even before he gets to that point]], it's nigh-impossible to turn him away; [[WhatTheHellHero calling him out on it]] will be ignored or [[ShutUpKirk retaliated against]]. ThePowerOfFriendship and ThePowerOfLove were lost to him the moment [[TheCallKnowsWhereYouLive the atrocity that sent him on his wild goose chase]] happened; he feels that TeamSpirit is just a hindrance, and that LoveIsAWeakness that he can't afford to have. {{Heel Realization}}s will be [[IgnoredEpiphany ignored or viewed as a moment of weakness to crush]], and he will never have an "IveComeTooFar" or "NoPlaceForMeThere" moment. Those require insight which he just doesn't have. In fact, his views are utterly incorrigible; he's either a TautologicalTemplar or is very far down the road to becoming one, and [[ObliviouslyEvil he is utterly convinced of his own moral infallibility and the righteousness of his own cause]]. The more his quest drags on or throws up hurdles, the more likely it is that [[MotiveDecay he'll forget just what his original mission even was]], In fact, the further along in his quest he is, the more likely it is that he'll get a ''lot'' more dangerous due to how fast his list of targets can mushroom when he isn't entirely sure who his enemies are any more. Don't expect him to make a HeroicSacrifice or HeelFaceTurn anytime soon; if he dies in the process of bringing his nemesis down, it's usually with him crossing into Villainstown in his moment of glory. If he [[StartOfDarkness doesn't die...]]
16
17The "fighting monsters" line represents what is a recognizable MoralEventHorizon for heroes, and both [[AntiHero Anti-Heroes]] and [[WellIntentionedExtremist Well-Intentioned Extremists]] live just near the boundary, especially the more pitiless GoodIsNotNice, [[TheUnfettered Unfettered]], PragmaticHero types. Engaging in VanHelsingHateCrimes is a good indicator of having ''crossed'' the boundary and a KnightTemplar is most certainly beyond it.
18
19A significant reason why this happens is the avenger's motivation. Those who seek justice are out to stop the villain from hurting any more people, because they don't want them to suffer like they have; and while they may be [[AntiHero ruthless]] about pursuing the villain (and may even be willing to kill the villain if they are dangerous enough), they're ultimately looking to benefit society, so long as they don't [[MotiveDecay forget their cause]]. Meanwhile, those who seek revenge are out to make the villain suffer for what they did to them or those close to them, believing that what was done to them has given them the right to inflict pain in return. They're not looking to improve society; they're doing it [[ItsAllAboutMe for their own sake]].
20
21As expected, this twisted situation is very popular in the Revenge {{Tragedy}} genre, especially because of its inherent DramaticIrony. [[note]]Nietzsche himself was also inspired by Ancient Greek tragic antihero archetypes; see also his first book ''The Birth of Tragedy.''[[/note]] This trope can also be used to demonstrate how "eye-for-an-eye" justice, while sounding like sweet [[CallItKarma Karmic]] EquivalentExchange Justice at first, can [[CycleOfRevenge easily spiral out into utter chaos]] if the hero lets his passions, wrath, and {{Pride}} forgo rationality.
22
23May be expressed through the page quote, or via the common misquote "When you become obsessed with the enemy, you ''become'' the enemy".
24
25When they cross the line or vice versa, RedemptionEqualsDeath is the only solution for his HeelFaceTurn. This may lead to AlasPoorVillain, if the one who fights monsters is an antagonist/a villain of a certain work.
26
27Not to be confused with CompleteMonster. Although somebody might become one by fighting such monsters, this is very rare. They can range from AntiHero to anywhere above. See also CycleOfRevenge, TheDarkSideWillMakeYouForget, ProtagonistJourneyToVillain, YouAreWhatYouHate, ThenLetMeBeEvil, and BecameTheirOwnAntithesis. If this trope happens to a child, it can be used as a FreudianExcuse of a character who UsedToBeASweetKid. Compare AndThenJohnWasAZombie, where the character becomes a literal monster. IfYouKillHimYouWillBeJustLikeHim is pretty much a sped-up version of this. Political equivalents are TheHorseshoeEffect, ReignOfTerror, FullCircleRevolution, and MeetTheNewBoss, although in character-driven political novels, this trope itself often shows up. If the monster in question is an animal, that's AnimalNemesis. If the monster is supernatural, it's a decidedly ''un''heroic instance of HunterOfMonsters. When this happens on a species wide scale, compare HumansAreTheRealMonsters. Subtrope of SlowlySlippingIntoEvil.
28
29RevengeIsNotJustice is more of a response that's invoked in an effort to stop the person from becoming a monster. If the person has become a monster, then RevengeIsNotJustice is invoked to call them out for becoming a monster. VigilanteInjustice is often the starting point of a hero's descent into villainy as they have killed someone in self-defense or they killed the villain under the belief that it's the only way to get rid of a villain who's truly irredeemable.
30
31Contrast TheChainOfHarm, when instead of going after the perpetrator, they will go after the easiest nearby target.
32
33Not to be confused with ''Manga/ThoseWhoHuntElves'', ''Literature/HeWhoFightsWithMonsters'', [[JustForFun/IReadThatAs or]] ''VideoGame/MonsterHunter''. For the ''Manga/RosarioPlusVampire'' fanfic, see ''Fanfic/HeWhoFightsMonsters'' (though this one is an example of this trope).
34
35[[noreallife]]
36----
37!!Examples
38[[index]]
39* HeWhoFightsMonsters/AnimeAndManga
40* HeWhoFightsMonsters/ComicBooks
41* HeWhoFightsMonsters/FanWorks
42* [[HeWhoFightsMonsters/LiveActionFilms Film — Live-Action]]
43* HeWhoFightsMonsters/{{Literature}}
44* HeWhoFightsMonsters/LiveActionTV
45* HeWhoFightsMonsters/TabletopGames
46* HeWhoFightsMonsters/VideoGames
47[[/index]]
48
49%%%
50%%% Zero Context Example entries are not allowed on wiki pages. All such entries have been commented out.
51%%% Add explanations to the entries before uncommenting them.
52%%%
53[[foldercontrol]]
54
55[[folder:Film — Animation]]
56* ''WesternAnimation/BatmanMaskOfThePhantasm'': Alfred also refers to the Nietzschian quote, in regards to [[spoiler:the Phantasm -- that is, Andrea]].
57-->'''Alfred:''' Vengeance blackens the soul, Bruce. I've always feared that you would become that which you fought against. You walk the edge of that abyss every night, but you haven't fallen in and I thank heaven for that. [[spoiler:But Andrea fell into that pit years ago, and no one, not even you, could have pulled her back.]]
58* ''WesternAnimation/BatmanUnderTheRedHood'', like ''Phantasm'', examines this Trope, only this time in regards to [[spoiler:Jason Todd]].
59-->'''Batman:''' It'd be too damned ''easy''. All I've ever wanted to do is kill him [[[Characters/BatmanTheJoker The Joker]]]. A day doesn't go by when I don't think about subjecting him to every horrendous torture he's dealt out to others and then... '''end him'''.[...] But if I do that, if I allow myself to go down into that place, I'll never come back.
60* Creator/DreamworksAnimation's ''WesternAnimation/MonstersVsAliens'' has an interesting inversion in General WR Monger, who spent 50 years as the warden for the titular Monsters, and ended up just as nice and eccentric as the monsters themselves.
61* Agent Kent Mansley from ''WesternAnimation/TheIronGiant'', whose fanatical anti-communist efforts made him unable to accept the titular robot's overtures of peace, even when the general he was advising was willing to stand his soldiers down. He then [[spoiler:got a nuke launched at a small American coastal town. [[TooDumbToLive Where he happened to be]]]].
62* ''WesternAnimation/JusticeLeagueCrisisOnTwoEarths'', after Batman's OmnicidalManiac EvilDoppelganger Owlman gives him a NotSoDifferentRemark, Batman's eventual rebuttal (and PreMortemOneLiner) references the Nietzsche quote.
63-->'''Batman:''' There ''is'' a difference between you and me. We both looked into the abyss, but when it looked back at us... ''you blinked''.
64* ''WesternAnimation/SupermanVsTheElite'': Superman shows [[BewareTheSuperman how frightening]] he can be to people who [[BeCarefulWhatYouWishFor wished he would cross this line]].
65* ''WesternAnimation/BigHero6'':
66** The BigBad, Yokai a.k.a [[spoiler: Professor Callaghan blames Krei for cutting corners, then steals Hiro's invention and uses it to get his revenge, not minding the damage he causes in the process. Krei is indirectly responsible for (apparent) death of his daughter, and on his RoaringRampageOfRevenge, Callaghan [[AccidentalMurder indirectly causes Tadashi's death]]. Only his daughter turns out to be alive while for Tadashi, there is no such luck]].
67** Similarly to Yokai, [[TheHero Hiro]] attempts to [[spoiler:use Baymax to kill Callaghan after the latter angers Hiro by [[LackOfEmpathy callously dismissing Tadashi's death]]. However, Hiro's team and Baymax help him [[DefiedTrope defy]] this trope when they bring him back to his senses.]]
68* In ''WesternAnimation/SpiderManAcrossTheSpiderVerse'', [[spoiler:Miles spent the entirety of the previous film trying to stop [[Characters/MarvelComicsTheKingpin The Kingpin]] from [[WellIntentionedExtremist jeopardizing their universe for his family]], but ends up doing the same thing here after learning that his father is fated to die and [[YouCantFightFate attempting to stop it]] would result in a RealityBreakingParadox, which he disregards. The other Spider-Men in the AllianceOfAlternates desperately try to get him to embrace WithGreatPowerComesGreatResponsibility, and when that fails resort to trying to beat sense into him BecauseDestinySaysSo]].
69* ''Film/TeamAmericaWorldPolice'' has the titular team boasting themselves to be anti-terrorist freedom fighters ("Terrorists, your game is through cause now you have to answer to America!") but they end up causing even ''more'' damage than the terrorists intended.
70* ''WesternAnimation/ParaNorman'': The legendary witch was so intent on punishing those who wronged her that she became just as angry and spiteful as them. Norman [[FreudianExcuseIsNoExcuse calls her out for wanting to hurt people just because]] [[spoiler:[[FreudianExcuse she's scared and angry, just like the townspeople did to her]]]].
71[[/folder]]
72
73[[folder:Music]]
74* Music/BobDylan's "My Back Pages":
75-->''In a soldier's stance, I aimed my hand\
76At the mongrel dogs who teach\
77Fearing not I'd become my enemy\
78In the instant that I preach''
79** While Dylan presumably was writing about the {{Author Tract}}s of his earlier "protest music" period, these lines would also prove oddly prophetic with regard to some of his later work. (''Slow Train Coming'', anyone?)
80* Music/{{U2}}'s "Peace on Earth":
81-->''They say that what you mock\
82Will surely overtake you\
83And you become a monster\
84So the monster will not break you''
85* Music/{{Radiohead}}'s "Bangers and Mash":
86-->''If you stare into the dark, the dark will stare back\
87back into your SOOOOOOOOOUUUUUUUUUUUUUL''
88* "The Nature of the Beast" by Music/IceNineKills:
89-->''Where is the end? What have we done?''\
90''We're what we swore we'd not become.''
91* Music/{{Atreyu}}'s "Becoming The Bull"
92-->''Grab the bull by the horns the old adage goes\
93Nobody tells you where to go from there\
94Seems like fate's pulling you\
95Decisions have to be made\
96The best path is the hardest earned\
97Back and forth the struggle consumes us all\
98Trying to keep a level head\
99In the most unsettling of times\
100Today I'll become the bull.''
101* This happens at the end of "Strength of the World" by Music/AvengedSevenfold after the narrator went on a RoaringRampageOfRevenge on those who killed his family:
102-->''So far forever now alone, a greater punishment on me has been imposed\
103A killer falling from the light, I'll miss my family, I'll never be alright''
104* "[[https://www.youtube.com/watch?v=zK268TLKCK4 Night of the Hunter]]" by [[Music/ThirtySecondsToMars 30 Seconds To Mars]]:
105-->''I was born of the womb of a poisonous spell\
106Beaten and broken and chased from the land\
107But I rise up above it, high up above it and see\
108I was hung from the tree made of tongues of the weak\
109The branches, the bones of the liars, the thieves\
110Rise up above it, high up above it and see\
111Pray to your God, open your heart\
112Whatever you do, don't be afraid of the dark\
113Cover your eyes, the devil's inside\
114One night of the hunter\
115One day I will get revenge\
116One night to remember\
117One day it'll all just end, oh\
118Blessed by a bitch from a bastard's seed\
119Pleasure to meet you, prepare to bleed\
120Rise, I'll rise, I'll rise\
121Skinned her alive, ripped her apart\
122Scattered her ashes, buried her heart\
123Rise up above it, high up above it and see''
124* "[[https://www.youtube.com/watch?v=HDKBeSMEBlk Murder]]" by Music/WithinTemptation and indeed most of the album ''The Unforgiving'' [[KnightTemplar is about violently hunting down monsters]]:
125-->''I'm about to do it your way\
126I will make your world unsafe\
127I never thought you'd get this far\
128It's insane''
129* Possibly implied in "Crawl" by Music/BreakingBenjamin:
130-->''[[IAmAMonster I'm becoming a monster,]][[NotSoDifferentRemark just like you]]\
131[[BreakTheBadass After it all, you'll try to break me too]]''
132* The running theme of "[[https://www.youtube.com/watch?v=NnPloIFgU8k The eye of the abyss]]" by Music/{{Vader|Band}} describing the fall into the abyss
133-->'' Burning horizon and the Black Eye\
134Like a dominating Sun\
135The Abyss ever-lusting\
136Fear turns into hate\
137You are screaming and falling\
138Wings of fire melting the flesh\
139Alone in this suffering\
140Pain and pride exploding...FOREVER!''
141* The song '[[https://www.nicovideo.jp/watch/sm23229863 Persecution Complex Cellphone Girl (lol)]]' is about the titular girl whose heart had been broken by a lying man. She thus uses her phone to seek out similar lying men, seduces and leaves them broken due to believing that all men are trash. At the end, her phone seeks out the next liar - her. And thus, the last line of the song is:
142-->''You're the liar. Just go die. Bye bye!''
143* Tim Pool's ''Will of the People'' is a song about one ideology after another taking a country over, and each time a rebellion successfully takes down a regime and takes over the government, they become as tyrannical as the regime they overthrew, leading to one big vicious cycle.
144
145[[/folder]]
146
147[[folder:Myths & Religion]]
148* In Myth/JapaneseMythology, a person who kills many {{Youkai}} will be transformed into a youkai. This occasionally gets played around with in games, manga, and anime from the country—for example, in ''VideoGame/LaPucelle'', this is the basis for a NonStandardGameOver, one that gets taken more or less as canon in the ''Franchise/{{Disgaea}}'' series. And in ''Manga/InuYasha'', the murderous Bankotsu of the Band of Seven manages to transform his weapon into a demonic blade by using it to kill 1000 youkai and 1000 human warlords. It also shows up in ''Manga/{{Saiyuki}}'', where it's a part of Hakkai's backstory.
149** ''Saiyuki'''s portrayal of this myth especially invokes this: while the various anime adaptations more or less consistently show that merely killing a thousand youkai turns one into a youkai, in the manga Hakkai's case is unique, and WordOfGod specifically states that it's not the act of killing or "being bathed in youkai blood" that triggers the transformation, but the killer's inner negative energy. In other words, this can only happen to those who already lost enough of their humanity and cultivated enough of their hatred that they might as well be compared to monsters themselves.
150[[/folder]]
151
152[[folder:Pro Wrestling]]
153* Wrestling/StoneColdSteveAustin's Heel turn during the Wrestling/{{WWE}} Wrestling/AttitudeEra. After years of battling Wrestling/VinceMcMahon and eventually Wrestling/TripleH who was with Vince, Austin out of desperation to become the WWE Champion again, does a WeCanRuleTogether and reveals he joined Vince at Wrestling/WrestleMania X-Seven. Cemented during the following Monday Night Raw broadcast where Steve Austin publicly beats up his best friend Wrestling/JimRoss who openly spoke against Austin's decision.
154:: Austin was on the other side of it a few years earlier during his feud with Wrestling/BretHart. Austin kept going after Bret, calling him out, and attacking him at every opportunity. Getting beaten by Bret in matches didn't discourage Austin, who kept hounding him. So it really shouldn't have been a surprise that Bret finally got angry enough to absolutely brutalize Austin in their famous submission match at Wrestling/WrestleMania, which was the beginning of his FaceHeelTurn.
155* [[Wrestling/StevieRichards Dr Stevie]] became more and more violent in his efforts to deal with the violently insane. In some ways, he was worse than his patients, as they really couldn't help it but Stevie knew exactly what he was doing. Then again, since Stevie thought this approach would work, all evidence to the contrary, one could say he had become insane himself, albeit in a different way.
156* Hinted at the end of [[Wrestling/KevinSteen Kevin Owens]] and [[Wrestling/SamiZayn El Generico]]'s confrontation at Wrestling/RingOfHonor Final Battle 2010. Generico, after suffering a whole year of his former friend's abuse, has Steen on his knees and is holding the very chair that was used to start the feud a year earlier. As Generico swings it, Steen holds up Generico's former mask, as if to suggest actually hitting him would make him just as bad as he is. Generico holds the mask up to his face, contemplates it... [[spoiler:[[AvertedTrope And realizes that no, Kevin Steen is just a complete scumbag who deserves to get hit in the face.]] He drops the mask, smacks Steen with the chair, and pins him for the victory.]]
157* Wrestling/{{Carl|itoColon}}y originally had no interest in becoming a pro wrestler and was happy to just help around the family business, working as a camera man in WWC. This changed when Ray González began targeting Carly because he was feuding with Carly's father at the time. 14 years later, Carlito Caribbean Cool is one of the top wrestlers in WWC and is targeting Ray González Jr, who till then was content to simply help with his father's mini market.
158* While Wrestling/SurvivalTobita's Saitama Pro Wrestling Company featured him fighting a variety of {{Wrestling Monster}}s, often of the {{Kaiju}} variety, he averts this due to his staying a {{Face}}[[note]]The promotion was a one-man show.[[/note]] and due to the silliness of some of the monsters.
159* Wrestling/RomanReigns became this when he underwent his FaceHeelTurn. He had been established as the main rival of Wrestling/TheAuthority, which was an example of InvincibleVillain, and when he gained the Universal Title, he, too, became an InvincibleVillain, holding on to it for over two years, longer than any Authority aligned wrestler.
160[[/folder]]
161
162[[folder:Roleplay]]
163* In ''Roleplay/TheGamersAlliance'', [[LovableRogue Refan]] becomes a more jaded and bloodthirsty killer as he ends up having to fight more and more enemies to protect his loved ones. When the enemies get tougher, he has to resort to using his demonic side, which is slowly corrupting him.
164* ''Roleplay/SurvivalOfTheFittest'':
165** Adam Dodd in turns into one of these for a good while during his tenure on the v1 island. His obsession with getting revenge on Cody Jenson leads him to mow down a good six or seven of his fellow students, despite his supposedly heroic motives. In something of a subversion, however, he lives to come to realise that his actions have been misguided and returns to a more conventional AntiHero mold.
166** The entire concept of player-killers is based in this. They're targeting people who are playing the game, but in doing so are becoming players themselves. One example is Imraan Al-Hariq of V4, who hunts down Ivan Kuznetsov and Tabi Gweneth because they've both killed once. Never mind the fact that Tabi's single kill was [[spoiler:multiple-murderer Clio Gabriella]], and it was only to protect Ivan. What makes it worse though is that Imraan ''acknowledges this and still tries to kill her''.
167[[/folder]]
168
169[[folder:Theatre]]
170* ''Theatre/CesareIlCreatoreCheHaDistrutto'' has TheElevenOClockNumber where the titular Cesare Borgia sings a duet with Creator/DanteAlighieri (a vision in his mind) discussing this issue (whether or not Cesare should leave the church and do more good outside of it, seeking power to destroy the corrupt church, and whether doing so would make him as corrupt as those he opposes).
171%%%* Aeschylus's ''[[Theatre/TheOresteia Oresteia]]'' trilogy.
172%%%* ''Theatre/{{Hamlet}}'' is the most well-known play in the Revenge Tragedy genre.
173* OlderThanSteam: ''Theatre/TheRevengersTragedy'' starts when the Duke propositions Vindice's wife, and when she refuses, he kills her. And [[CrossesTheLineTwice rapes her corpse]]. And what Vindice does, in the course of getting his revenge...is actually a hundred times worse.
174%%%* ''Theatre/TitusAndronicus''. Another Shakespearean side-splitter.
175* Seymour, the shmuck who feeds the man eating plant in Theatre/LittleShopOfHorrors, was actually the monster himself. All the plant did was sit there and tell him what to do, until Seymour broke his promise, at which point it repossessed Audrey.
176* ''{{Theatre/Sweeney Todd|TheDemonBarberOfFleetStreet}}'' is like the film example...only worse. [[spoiler:Johanna and Anthony Hope discover the carnage, with Toby turning the meat grinder, having gone completely insane. In some productions, Johanna and Anthony are under suspicion for killing the asylum keeper, and the blame for all of the murders falls upon Toby. In some shows, Todd opens his collar to allow Toby to kill him...]]
177* Theatre/CyranoDeBergerac: when Cyrano gives us his BullyHunter speech in Act I Scene IV, he has just bullied a poor Bore who only slightly bothered Cyrano...So Cyrano, according to the LawOfDisproportionateResponse, invokes the BerserkButton of his nose so he can dispense DisproportionateRetribution, kicking the Bore’s ass. It’s obvious that Cyrano has been bullied before [[TheGrotesque because of his enormous nose]], but he is so badass compared to anyone else in the play that now ''he is the bully.''
178* In ''Theatre/TheSecretOfSherlockHolmes'', the titular secret is that [[spoiler:Literature/SherlockHolmes is actually [[DiabolicalMastermind Professor Moriarty]] as well, an alter-ego [[WellIntentionedExtremist to allow him a tight watch on the criminal world]] and [[GoodIsNotNice to keep him from getting bored]]]].
179* ''Theatre/{{Sleuth}}'': Milo, who initially disapproves of Andrew's gameplaying, starts playing back to prevent Andrew getting the last laugh, and proves disconcertingly adept.
180[[/folder]]
181
182[[folder:Visual Novels]]
183* ''Franchise/AceAttorney'':
184** [[spoiler:Godot]] definitely qualifies. Starting as a [[spoiler:defense attorney, he gets poisoned by a criminal, barely escaping death with damaged sight. Upon finding that his girlfriend, Mia, was killed by a criminal, and Phoenix failed to help her, he holds a grudge against him, and sets up ThePlan to prevent Maya, Mia's sister, from suffering the same fate...only to find the criminal that poisoned him, Dahlia, and in his rage, try to kill her.]] While he was successful, he admits that he acted out of revenge rather than the desire for justice.
185** [[spoiler:Phoenix Wright]] himself becomes this in ''VisualNovel/ApolloJusticeAceAttorney''. After having his attorney's badge taken away for [[spoiler:(accidentally) presenting forged evidence, he loses respect for the whole judicial process, and manipulates crime scenes, forging evidence to get Kristoph Gavin convicted]]. He gets better by ''Dual Destinies''.
186** [[spoiler:Damon Gant]] used increasingly unethical methods ([[spoiler:including murdering a subordinate and framing a 14-year-old girl for it for the sole purpose of blackmailing her sister into framing someone else]]) to increase his control over the investigative process and neutralize criminals who could not be convicted otherwise, such as Joe Darke.
187** In the sequel to ''VisualNovel/AceAttorneyInvestigations'', the final villain ([[spoiler:Simon Keyes]]) was driven to commit a large array of crimes including [[spoiler:kidnapping two minors and framing both of them for murder, killing a man with a falling hot-air balloon and arranging the murders of two other people, all so that the murderers would be caught and arrested]] because [[spoiler:he had been a witness to a murder 12 years earlier but was silenced by the joint conspiracy of Blaise Debeste, Patricia Roland and the fake Di-Jung Huang and forced to go on the run in order to avoid being killed. Edgeworth even points out that his motive was a mix of justice and revenge but that he had become as bad as his enemies]]. At the end of the game, Edgeworth pledges to capture corrupt people in power before their victims become examples of this trope.
188** At the end of the third case of ''VisualNovel/TheGreatAceAttorney: Adventures'', mere minutes after [[spoiler: Magnus [=McGilded=]]] is erroneously declared not guilty, [[spoiler: he is led back into the courtroom by a bailiff for further inspection of the omnibus where the murder took place -- he is then locked inside the omnibus as it's doused with paraffin and lit on fire, leaving him to burn to death. At the end of the final case, culprit Ashley Graydon confesses that that bailiff was an assassin he hired to kill [=McGilded=], a smooth-talking VillainWithGoodPublicity who used his many public works projects to draw attention away from the fact that he made his vast fortune off of vicious loansharking -- not only did he fabricate evidence and threaten Gina into providing false testimony, which together brought about his not guilty verdict, but it turns out that prior to his death, he had been working with Graydon, a communications officer, to secretly record and sell state secrets as acts of high treason. Graydon had returned to his childhood home in the slums and asked his father, whom he hadn't seen in years as part of his attempt to distance himself from his past, to make the music disks used in the scheme under the guise of giving them to a musician friend; Mason eventually realized that his son was being dishonest and insisted on being the middle-man for the next hand-off. During the course of an argument inside the aforementioned omnibus over the disk, [=McGilded=] stabbed him to death. Graydon says that he didn't realize how truly evil [=McGilded=] was until he killed Mason, and that he then vowed on his father's name to exact revenge and rid the world of a "monster." He also (unintentionally) shot and killed Pop Windibank while attempting to retrieve the disk that Mason died over and tried to pin the crime on Gina. Barok van Zieks points out that by attempting to use his wealth and influence to get away with murder, he became the very kind of person he hated in McGilded. Graydon solemnly agrees]].
189** ''The Great Ace Attorney 2: Resolve'':
190*** The culprit of case 1 gets called out for this, since even though his victim was a murderer on the verge of becoming a KarmaHoudini, he still tried to frame an innocent teenage girl for his crime.
191*** In case 3, [[spoiler:several years after Odie Asman ruined Enoch Drebber's aspiring career as a scientist, Drebber decided to have revenge against Asman by killing him. However, he himself ended up crushing Albert Harebrayne's own scientific ambitions by using him as an UnwittingPawn in his revenge scheme]].
192*** [[spoiler: Kazuma Asogi]] comes ''dangerously'' close to this during the final trial, [[spoiler: when he tries to do the ''exact same thing'' to Barok that he hates Barok for doing in the backstory- prosecuting despite a conflict of interests and convicting an innocent man due to personal biases. Kazuma just gets lucky that Ryunosuke was there to snap him out of it before he could get Barok declared guilty]].
193*** [[spoiler:Mael Stronghart believed that the Reaper assassinations were a necessary evil to punish criminal masterminds who use JuryAndWitnessTampering to get away with their crimes. In the process of creating his conspiracy, he had several people blackmailed and killed, including the Lord Chief Justice before him, who Stronghart had killed just so [[KlingonPromotion he could take his place]]. So in attempting to curtail London's crime rate, he himself became a criminal mastermind.]]
194* Archer from ''VisualNovel/FateStayNight''. The famous "Unlimited Blade Works" poem that he had supposedly written about himself even carries a message that is very similar in nature to the "He who fights monsters" quote itself (if you manage to decipher its incomprehensible language that is). It tells the story of a man who spent his whole life in an agonizing pursuit through self-sacrifice, to become the hero of his ideals, until he one day realized that it was an ideal that could never be met, that evil would always persist, that all his sacrifices had been in vain, and that he had ultimately only managed to turn himself into a killer without a cause. He was just another part of the evil in the world that he once had thought he was fighting. The man who wielded swords had thus lost his identity to the point where there no longer was a man, there were only his weapons. He was "a man made of swords".
195* ''VisualNovel/IkemenSengoku'':
196** Kennyo used to be a gentle, peaceful monk until the massacre of his monk brothers by Nobunaga Oda drove him to commit heinous deeds to avenge them. He's fully aware that he's become a monster himself in his RoaringRampageOfRevenge to take down the Devil King, but believes that dooming himself to Hell is worth it if he can drag down Nobunaga there with him.
197** Motonari, who lost many loved ones and suffered through a bloody power struggle when he was younger, became an OmnicidalManiac who wants to turn all of Japan into a violent, lawless hellscape where only chaos reigns. The main character, after learning about Motonari's past from Sasuke, thinks that the quote "he who fights with monsters" would apply well to him.
198* The Church in ''VisualNovel/{{Tsukihime}}'' is known as being fanatically zealous about killing non-humans. Other characters imply, and we have even seen, that there are some demon hybrids/vampires who are neutral or good. The Church does not care, so it does not tend to get along with those like the Tohnos (hybrids, but avoid inversion), Arcueid (vampire, but kills vampires and is too tough for them to beat), and the Nanayas, who only targeted the Inverted. Notably, the only Church characters we see are a bit heretical for not blowing everything up first and then covering it up. It's not surprising for them to be heretics considering that the Church is repeatedly stated to have no influence in Japan -- since any members of the Church are the only representatives of it for dozens, if not hundreds, of miles, it's pretty safe to act as they please.
199[[/folder]]
200
201[[folder:Web Animation]]
202* ''WebAnimation/{{RWBY}}'':
203** The White Fang was once a peaceful protest group, trying to advocate peace between humans and [[LittleBitBeastly Faunus]], but five years prior to the start of the series, a faction within the group, feeling that said peaceful protests were getting them nowhere, staged a coup and took control of the entire organization. Adam Taurus invents the "Grimm mask", which his faction wears in the belief that, if humans are going to call them monsters, they may as well don the faces of the Grimm and behave as monsters. Not only does humanity revile them, but other Faunus do, too. [[spoiler:Adam Taurus ends up murdering High Leader Sienna Khan in Volume 5 for being too moderate, taking control of the organisation so he can repeat his contribution to the destruction of Beacon Academy by attacking Haven Academy; this time, he is stopped and his abandonment of the White Fang to save his own skin ends up destroying the very organisation he transformed.]]
204** General Ironwood has always trod the ethical grey area in his contributions to the fight against evil, but after Volume 3 he begins taking increasingly authoritarian actions to circumvent the plans of the villains. Throughout Volume 7, the villains exploit his paranoia and past trauma to shred away the positive aspects of his character; at one point Ironwood himself wonders if Salem's strength and success lies in her lack of humanity, and Watts is thrilled to hear him declare that he will "sacrifice whatever it takes" to defeat her. [[spoiler:By the end of the volume, Ironwood has devolved into a paranoid dictator, willing to abandon the rest of the kingdom and all of Remnant just to hide Atlas from Salem's forces, and issues arrests on the heroes just for disagreeing with his inhumane plans. When Oscar points out that Ironwood's current mentality makes him just as bad as Salem, Ironwood shoots him, setting up him replacing Salem as ArcVillain in Volume 8.]]
205[[/folder]]
206
207[[folder:Webcomics]]
208* In ''Webcomic/TheAdventuresOfDrMcNinja'', when the doc is subject to MoreThanMindControl by an evil motorcycle helping him hunt down King Radical, this trope provides the "More Than" part.
209-->'''Alt Text:''' To be fair, Doc always WANTED to blow up helicopters. The bike just gave him the means.
210%%%* ''AmazingSuperPowers'' provides an [[http://www.amazingsuperpowers.com/2009/02/loose-cannon/ amusing variation]] of this.
211* ''Webcomic/BittersweetCandyBowl'':
212** Abbey grew up with a father who would verbally and physically abuse his mother badly enough for him to [[spoiler:have the police arrest his father while his mother’s injuries led to her death]]. Since then, Abbey and his younger sister Molly live in foster care with a loving cat and dog couple [[note]]only two people of the same species can have kids in-universe[[/note]]. However, this made him fiercely overprotective of those who are harassed (mainly girls) to the point of assaulting the instigators.
213** After years of taking {{Tsundere}}-ish abuse from Lucy, Mike finally, shall we say, "gets her back" by not only [[spoiler:turning her down, but eventually ''[[KickTheDog brutally and deliberately destroying]]'' any trace of their relationship, professional or otherwise]]. The problem is, [[spoiler:Lucy has already gone through ''extreme'' CharacterDevelopment by this point, so Mike's actions [[DespairEventHorizon cause her to spiral into a deep, near suicidal depression,]]]] [[TookALevelInJerkass which makes him as bad, if not WORSE to her than she ever was to him.]]
214* When the second part of the phrase (the abyss part) was used in ''Webcomic/TheBMovieComic'', creator Roman Wunderlich declared in TheRant that he didn't understand what the big deal was:
215-->"I never understood what's supposed to be so bad about that... I mean, I'd see that the abyss is deep, and the abyss'd see that I'm shallow — but it's not like I've been denying that, anyway..."
216* Jenn of ''Webcomic/CaseyAndAndy'' just manages to catch herself [[http://www.galactanet.com/comic/view.php?strip=416 doing this]].
217* The Vatican and Aesir churches of ''Webcomic/CryHavoc'' level cities to destroy a handful of daemons. Although, seeing as the last time their foes congregated, a decade long war that killed half of the world's population occurred, they may be more justified than most.
218* ''Webcomic/DominicDeegan'': [[spoiler:King David Johann]]'s obsession with human supremacy (in magic, specifically) eventually turned half his soul into an all-consuming EldritchAbomination, and the other half into a genocidal dictator who wanted to kill everyone outside of his kingdom and then mutate half his people.
219* In the series, ''Webcomic/ForLoveNorMoney'', [[spoiler: Eamonn makes it more than evident that he despises everything about his uncle and the perversion he reaps on those around him, especially his mother, and when he chooses to challenge him directly, John Lees opts to rape his mother and leave his half-sister to die of Whooping Cough. To kill the perceived monster of his life, Eamonn resolves to murder his uncle out of revenge and honour, even though this in turn makes a monster out of him]].
220* In ''Webcomic/GirlGenius'', the main reason that the BigBad the Other, aka Lucrezia Mongfish, is so reviled is her use of [[MindRape mind-control via slaver wasp]]—if one [[NightmareFuel flies into your mouth]], you become susceptible to any order given by her—one character is ordered to die, [[http://www.girlgeniusonline.com/comic.php?date=20061113#.Vvqv8OIrLIU and does so immediately]]. [[WellIntentionedExtremist Baron Wulfenbach]] is her main enemy, with the stated aim of destroying her and all her work, no matter what it takes. Which makes his [[GrandTheftMe personality overlay]] onto [[spoiler:his son, Gil]] extremely hypocritical, especially since this is ''the exact same thing'' that Lucrezia did to [[spoiler:her daughter Agatha]]. It's called out by the BigBad herself in comic, that in trying to protect [[spoiler:Gil]] from her influence he's ended up becoming just as bad as she is. [[spoiler:Of course, he doesn't ''care'' what he is, as long as he remembers who he mass-murders people for.]]
221--> '''Lucrezia [[spoiler:in Agatha]]:''' My goodness! How Mister High-and-Holy has fallen! Using your '''''[[spoiler:own son?]]'''''
222* ''Webcomic/KuroShouri'': Hisaki believes he is right to strike down his brother [[spoiler:who killed their parents]], but he often resorts to extremely violent methods with little provocation.
223* ''Webcomic/{{Oglaf}}'' [[PlayedForLaughs plays this trope for laughs]] in that [[https://www.oglaf.com/abyss/ strip]].
224* ''Webcomic/TheOrderOfTheStick'': [[spoiler:Vaarsuvius]] became a very literal example of this trope but has since "recovered" and now regrets their actions.
225* In ''Webcomic/{{Pacificators}}'', the reason regular people hates those with [[ElementalPowers powers]] so much is because one of their best Pacificators ever, [[SanitySlippage Castella]] [[DisproportionateRetribution Brandsford]], went mad and [[TearJerker murdered thousands of people]] before she was finally killed herself.
226* ''WebComic/ParanormalMysterySquad'': Stephanie is introduced as having a staunch [[VanHelsingHateCrimes zero-tolerance policy]] against cryptids, because of what happened to her parents. However, by the time of the ''[[Webcomic/VampireCheerleaders "Vampire Cheerleaders Must Die!"]]'' arc, she's [[CharacterDevelopment come to accept that]] [[https://web.archive.org/web/20121007202323/http://www.vampirecheerleaders.net/strips-vc/my_dark_passenger not all cryptids are evil as she first thought]], as a result of her sister becoming a werewolf and after spending time with their friends, who're also cryptids. [[spoiler:Stephanie later becomes a rare literal example and figurative subversion when she becomes a cryptid herself.]]
227%%* As is usual, ''Webcomic/PennyArcade'' gives us quite the [[http://www.penny-arcade.com/comic/2008/4/11/ atypical example.]]
228* This is invoked in ''Webcomic/PepsiaPhobia'': when Bambikles seeks to avenge his mother by killing [[HumansAreBastards the monster]] who took her life, he's told that "To ''kill'' a monster, you must ''become'' a monster." So he does (partly because his girlfriend promises to marry him if can become a true monster, subverting the VengeanceFeelsEmpty trope with AllGirlsWantBadBoys sex). [[spoiler:He can't go through with it and is killed off. His 'girlfriend' is revealed to be an evil A.I. mastermind, whose original function was to create fun, whimsical games of adventure. Too much time and too many battle simulations warped her programming.]]
229* ''Webcomic/SaturdayMorningBreakfastCereal'': [[https://www.smbc-comics.com/comic/monster-under-the-bed Don't let little boys triumph against hordes of monsters]]; [[MonsterIsAMommy sometimes their families come with them]].
230--> '''Kid:''' [[VanHelsingHateCrimes I AM THE MONSTER NOW!]] [[LackOfEmpathy Anyway can we have pancakes for breakfast?]]
231* In ''Webcomic/UnOrdinary'', John Doe is an heroic and kind high-school student at first, but as him and his best friend Seraphina get [[CrapsackWorld systematically bullied by the entire school]], [[spoiler:he adopts the identity of [[VillainProtagonist Joker]] and starts beating up the [[TheBully bullies]]. But even after proving his point, he can't stop being violent, and ends up becoming the type of bully he was originally fighting against]].
232* Professor Broadshoulders from ''Webcomic/ZebraGirl'' is obsessed with destroying demons and people tainted by demons, to the point where he sacrifices his very soul, giving into his own demonic curse and physically transforming into a demon, to destroy Sandra, the titular zebra girl, despite the fact that Sandra was still a good person, despite being transformed into a demon herself. Appropriately, it was Broadshoulders's attempts at destroying Sandra [[ThenLetMeBeEvil that finally pushed her over the edge]], turning her away from [[IJustWantToBeNormal wanting to cure her condition]] to [[EvilTastesGood indulge her demonic hunger for pain and torment]].
233[[/folder]]
234
235[[folder:Web Originals]]
236* Website/TVTropes: Some tropes come about as a deliberate attempt to defy a stereotype or cliché, only to become as over-exposed as the very thing they were defying. A good example is RealWomenDontWearDresses, which began life as an attempt to defy the stereotype of women as being weak and overly-sensitive, only to become a stereotype in and of itself that suggested that women who don't wear masculine clothing or act in a stereotypically masculine way are inferior to those that do.
237* ''Literature/FightingMonsters'' is named after this trope, and plays with it thoroughly, bringing up the original quote in the prologue, as well as throwing it at the main character in the form of a WhamLine.
238* In ''Literature/SailorNothing'', Himei worries that she is turning into this.
239* Satirized by Website/TheOnion in [[https://www.youtube.com/watch?v=EDWo6m5hbG4&feature=player_embedded "Little Boy Heroically Shoots, Mutilates Burglar"]].
240-->"'''[[BloodKnight I want the blood.]]'''"
241* The Union series. Combined Forces - Team 4 falls under this trope. While they start off as idealistic as soldiers go, they eventually devolve into bitter reflections of themselves that kill because they can, not because they have to. Taken to the extreme with Shadow Agents, clones born and bred to go as far into this trope as possible, becoming little better than what they're fighting.
242* ''WebOriginal/ProtectorsOfThePlotContinuum'':
243** Agents can become rather Sue-ish in their efforts to rid the Multiverse of sues. Of course, they never become anywhere near as bad as those that they are tasked with killing.
244** In the mission into ''Fanfic/RainbowFactory'', Caroline goes absolutely postal with the impostor Rainbow Dash, and later says she would probably have gone completely over the edge had Kilroy not hit upon the right word to bring her to her senses.
245* Subverted by WebSite/SFDebris, regarding [[Series/StarTrekVoyager Captain Janeway]]:
246--> She has stared into the abyss as it has stared into her... and the abyss said "[[EvenEvilHasStandards JESUS!]]"
247* In ''Literature/{{Worm}}'', Taylor begins to epitomize this trope as she gets deeper and deeper into the politics of being a [[DifferentlyPoweredIndividual cape]], eventually becoming a WellIntentionedExtremist who makes it clear that there are no lines that she refuses to cross if it accomplishes her goals.
248* In the Spanish creepypasta fanfiction [[https://www.wattpad.com/story/187281189-una-promesa-no-cumplida-ben-drowned-y-tu-terminada "Una promesa no cumplida"]], the protagonist is a nameless girl who one day loses her best friend to BEN and copes with it by going on a RoaringRampageOfRevenge against him. After a long time devoted to hunting him down to fulfill the titular vow to kill him, she tracks him down to [[FandomSpecificPlot the Creepypasta Mansion]] and goes fullblown LeeroyJenkins on BEN. After being finally defeated, the creepypastas, impressed with her AxCrazy hatred towards BEN and [[SuperPersistentPredator single minded obsession with killing him]] decide the best way to deal with her is to give her LaserGuidedAmnesia and welcome her into their ranks with open arms, turning her into another creepypasta monster like the one who she tried to kill.
249* ''Podcast/TheMagnusArchives'' has plenty of these. Characters that intend to use the abilities granted by the [[EldritchAbomination Dread Powers]] for heroic purposes inevitably end up succumbing to their monstrous side, while characters that avoid becoming tethered to the Powers remain physically human but often become more morally monstrous than the Avatars they fight.
250** Gertrude Robinson, despite her role as [[ApocalypseMaiden Archivist]], refused to use her Beholding abilities and devoted her life to stopping the Powers' rituals, including the Watcher's Crown. She prevented countless rituals over her lifetime... but to do so, she had to betray and [[FateWorseThanDeath sacrifice]] her assistants, doom innocent civilians, and commit all sorts of other crimes. It's nearly universally accepted that Gertrude was a terrible person. Her actions are put into an even harsher light by MAG 160, which reveals that [[spoiler:every ritual she destroyed was doomed to failure with or without her intervention, meaning the terrible acts she committed were AllForNothing]].
251** Most Hunters fall under this trope, including Daisy, Julia, and Trevor. They feed their god by hunting and killing monsters, but as time passes and their connection to the Hunt grows, they start caring less and less about whether they accidentally kill innocents as well.
252** Jon becomes this in later seasons. [[spoiler:As he settles into the role of [[ApocalypseMaiden Archivist]], he gains several evil-seeming powers -- a CompellingVoice, the ability to give people nightmares and then watch their dreams, the ability to [[MindRape rip information out of people's minds]], and a HorrorHunger for others' trauma - but at first he intends to only use these powers for good. But over time, he starts losing his moral scruples regarding his powers, first using them when they aren't absolutely necessary and then feeding on innocent civilians. By the end of season 4, he's the lynchpin in a successful Beholding ritual to bring about the apocalypse, all because he couldn't overcome his hunger for statements.]]
253[[/folder]]
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255[[folder:Web Videos]]
256* ''WebVideo/DreamSMP'':
257** '''''Heavily''''' {{discussed|Trope}} and {{deconstructed|Trope}}. Tommy and Tubbo are very aware of the looming possibility of them falling into [[FallenHero Wilbur]] and [[PresidentEvil Schlatt's]] footsteps, respectively, and try their hardest to avoid it and preserve their friendship. However, [[TheChessmaster Dream]] is their biggest obstacle, as he continually sows the seeds of conflict in order to break them apart, and even though they're aware of it they don't have a way to stop it from happening.
258** However, Quackity seems to play this trope fully straight via BecameTheirOwnAntithesis in his "Las Nevadas" series, going from [[spoiler:a WideEyedIdealist who opposed abuse of power to a [[JadeColoredGlasses disillusioned]] man who would resort to torture by exploiting abuse of power to achieve his increasingly morally questionable goals]].
259* {{Discussed|Trope}} by Gordon Freeman in ''WebVideo/FreemansMind'', although he can't remember whether Nietzsche said "monsters" or "drummers". He concludes that it must have been "drummers" [[ComicallyMissingThePoint because there was no way he could end up looking anything like the monsters he was fighting, especially not the fifty-foot tall Tentacle he was dealing with at the time.]]
260* [[Creator/BobChipman Moviebob]] made a reference to this trope in his review of ''WesternAnimation/ShrekForeverAfter'' while he was describing the progression of the ''Franchise/{{Shrek}}'' movies, pointing out that while the first movie was an original and entertaining parody of corporate-driven animated movies, the series had slowly progressed into becoming the very same type of corporate-driven animated movie that the first film had made fun of.
261* The {{Trope Namer|s}} is ''quoted'' in the teaser trailer for the [[Franchise/TheSlenderManMythos Slender Man]] series ''WebVideo/TribeTwelve''. And, sure enough, the series shows signs of this. [[spoiler:It's now inevitable (well, probably) as Firebrand, the Collective member that pulled a FaceHeelTurn (with the help of [[WebVideo/EverymanHYBRID HABIT]]) has been revealed to be a [[FutureMeScaresMe future version of]] Noah, the protagonist.]]
262* Nearly happens to Percy in ''WebVideo/CriticalRole''. He starts as the OnlySaneMan in the party, but when he finally encounters the people who slaughtered his family, he snaps, and starts to [[ColdBloodedTorture torture prisoners]] amongst other things. His friendship with Vox Machina keeps him from going over the edge, and gets rid of the demon that contracted with him (though a tiny fragment still lingers in the form of his Hex spell).
263[[/folder]]
264
265[[folder:Western Animation]]
266* ''WesternAnimation/AaahhRealMonsters'': Simon the Monster Hunter wanted to prove that monsters were real, and fancied himself the OnlySaneMan, despite how the world at large viewed him as a lunatic. As the series progressed, he developed a personal vendetta against Ickis that drove him to increasingly nastier and ever-more-insane plans, eventually becoming dead-set on getting his revenge on monsters in general and the Trio in particular.
267* A major theme in the "City of Thieves" episode of ''WesternAnimation/AdventureTime'', though it is used more for the RuleOfFunny.
268* ''WesternAnimation/AvatarTheLastAirbender'' features a lot of these.
269** [[WellIntentionedExtremist Jet]] was first established as a freedom fighter similar to Robin Hood, but was later shown to be completely willing to take some innocent lives in order to kill some Fire Nation soldiers. He calmed down a little eventually. And by "eventually", we mean "[[HeelFaceDoorSlam too late]]".
270** Fong the Earth Kingdom general, was obsessed with triggering the highly destructive Avatar State in Aang by ordering his men to attack him. He even went as far as to endanger Katara's life, by burying her alive.
271** Hama was an imprisoned waterbender who taught herself the dark art of bloodbending, allowing her to control the bodies of her victims in a rather painful way. She used this to escape the Fire Nation prison. In her later life she became at least as destructive and cruel as the fire benders she hated, as she used her bloodbending to abduct innocent Fire Nation citizens.
272** [[Characters/AvatarTheLastAirbenderKatara Katara]] herself almost becomes this trope in "[[Recap/AvatarTheLastAirbenderTheSouthernRaiders The Southern Raiders]]". In order to find closure to the death of her mother, she decides to hunt down the man responsible for it, going as far as to willingly use bloodbending, a technique she really did not want to learn in the first place. When she does find her mother's killer, she almost impales him with a barrage of icicles, but manages to restrain herself at the last minute.
273* This is a recurring theme in the SequelSeries, ''WesternAnimation/TheLegendOfKorra'', where each of the main antagonists stands for an ideal, but takes said ideal too far, resulting in them becoming the villain.
274** [[Characters/TheLegendOfKorraAmon Amon]] [[spoiler:was the son of the mob boss Yakone and a young waterbender who was taught by his father to bloodbend. Eventually his father's abuse of both him and his brother Tarrlok, brought him the belief that bending was the root of all evil and needed to be ended]]. By the time the series comes around and by the end of it he has become just as cruel as any bender was.
275** [[spoiler:Hiroshi Sato]] also fits, wanting to eradicate bending to avenge the murder of his wife. However, his thirst for vengeance goes to the point where he loses all capacity for love and [[OffingTheOffspring even attempts to murder his daughter who opposes him and his plans.]] [[CallingTheOldManOut She even tells him that his wife would hate what he's become.]]
276** [[Characters/TheLegendOfKorraAvatarKorra Korra]] herself came within spitting distance of this trope during season 2. After her father was arrested on charges of conspiring to kill Unalaq and sentenced to life in prison, Korra arbitrarily decided the judge was corrupt and chased him down after the trial, threatening to have Naga ''bite his head off'' if he didn't tell her what she wanted to know.
277** [[Characters/TheLegendOfKorraZaheer Zaheer]] wanted freedom for everyone and saw all the government corruption, incompetence and tyranny as something that needed to be dismantled completely in order to provide that. While no one shed tears over his first victim, [[AssholeVictim the tyrannical Earth Queen]], he still began an uprising and had plans to assassinate every world leader to plunge the world into complete anarchy. While he disdained hurting innocents, he wouldn't hesitate to do it to further his goals.
278** [[Characters/TheLegendOfKorraKuvira Kuvira]] was the result of Zaheer's uprising. Originally a brave and heroic woman, she desired the stabilization, safety and reuniting of the Earth Kingdom after Zaheer's uprising. The stabilization took three years to accomplish and she was determined to never let it happen again, nor let the circumstances that led to Zaheer to come back. So, she overthrew the outdated monarchy and established the Earth Empire, becoming an even worse tyrant than the previous Earth Queen ([[WellIntentionedExtremist albeit with much more noble intentions]]). [[spoiler:Korra revealing to her just how far she had fallen is what finally convinced her to surrender]].
279* The [[TheJailer eponymous villain]] of the ''WesternAnimation/BatmanTheAnimatedSeries'' episode "[[Recap/TheAdventuresOfBatmanAndRobinE17LockUp Lock-Up]]" is a fairly obvious [[StrawCharacter GOP pundit]] parody. Lyle Bolton constantly says that the "liberal media", "coddling doctors", and "gutless police" are responsible for super-crime in Gotham. He believes that the criminals at Arkham don't deserve privileges or even the most basic humane treatment. The first part of the point is not necessarily wrong given that those criminals include the likes of the Joker, Harley Quinn, Scarecrow, Killer Croc, Poison Ivy and plenty of more public threats. Obviously, he's hyperbolized, but it's still pretty severe for a [[ParentalBonus kids' show]].
280* ''WesternAnimation/Ben10UltimateAlien'': Charmcaster becomes this [[spoiler: after her best efforts in resurrecting her father drove her to madness and insanity to the point where she became even worse than the previous tyrant who killed him in the first place. After her father calls her out on this, [[HeelFaceTurn she gets better]]...[[HeelFaceRevolvingDoor mostly]]]].
281* After time traveling to a BadFuture, Gosalyn finds that her absence made WesternAnimation/DarkwingDuck turn into Darkwarrior Duck whose idea of justice is DisproportionateRetribution. He is, without a doubt, far worse than any of the villains who he has already disposed of permanently.
282* An episode of ''WesternAnimation/TheFairlyOddParents'' had Timmy [[SwappedRoles wishing to babysit Vicky.]] Before long, he ends up acting just as bad as Vicky did, to the point where Cosmo and Wanda get reassigned to her!
283* ''WesternAnimation/{{Gargoyles}}''. This is a recurring theme throughout the series.
284** Demona. Demona responds to human racism and genocide against her species by gradually turning into a raging, murderous, genocidal maniac who wants to kill all humans.
285** Jon Canmore/Castaway. Jon Canmore, to avoid having to admit that he spent his life hunting innocent people and that his own error paralyzed his brother for life, also becomes a genocidal maniac who wants to kill all gargoyles.
286** The Captain of the Guard, Gillecomgain, and Macbeth allowed their desire to revenge to turn themselves into monsters, though The Captain of the Guard and Macbeth managed to redeem themselves. Goliath also nearly succumbed to it, but he realized this was only another part of a pointless cycle of revenge.
287* ''WesternAnimation/JusticeLeague'':
288** The Justice Lords, the alternate reality counterparts to the League from "[[Recap/JusticeLeagueS2E11And12ABetterWorld A Better World]]", fell to this after Lex Luthor became president and killed the Flash.
289** In "[[Recap/JusticeLeagueUnlimitedS3E7PatriotAct Patriot Act]]", General Wade Eiling becomes so obsessed with taking down the show's titular League (and metahumans in general), that he injects himself with an unstable Nazi-created SuperSoldier serum in order to more readily combat them. His only claim to fame after this? Beating up seven non-powered second-stringers and causing the same superhuman fear-mongering from the citizens that he swore to protect from the League.
290--->'''General Eiling:''' ''[about to throw a car onto Shining Knight]'' Superman and your Justice League are a threat to a safe and stable world.\
291'''Elderly Woman:''' ''[standing between Shining Knight and Eiling]'' Drop the act. You think killing Superman would make the world safe? Or killing this boy? Or us? [[ArmorPiercingQuestion Tell me, how many of us do you have to kill to keep us safe?]]\
292'''General Eiling:''' They're the ones I'm after, not you. I'm not the menace, metahumans are! Superpowered beings!\
293'''Bystander:''' [[ArmorPiercingResponse You're the only one around here with superpowers!]]\
294''[Eiling stops, dropping the car]''\
295'''General Eiling:''' ...All right, [[YouAreWhatYouHate I've become what I hate]], [[LampshadeHanging I'll give you that]]. But in the long run, you'll see I was right. You'll see you need the likes of me to protect you from them.
296* This is apparently the reason for Shego from ''WesternAnimation/KimPossible'''s FaceHeelTurn (at least going by her LawfulStupid brother's version of events). More likely, she was fed up with [[DefectorFromDecadence their stupidity]].
297* Frequently lampshaded by Kion in ''WesternAnimation/TheLionGuard''. He was bestowed with the Roar of the Elders, which is given to the second-born cub, as the first is destined to be the king, while the 2nd is tasked with leading the Lion Guard, a group dedicated to preserving the kingdom and defending the Circle of Life. As its leader, the second-born cub is expected to be the fiercest of the group and is thus gifted with the Roar of the Elders by the Great Kings of the Past. Kion knows that Scar, Simba's grand-uncle, was bestowed with the Roar when Mufasa was heir, but used it for evil purposes, causing the Great Kings to strip Scar of the roar. Therefore, Kion's greatest fear is to become similar to Scar, and it is this reason that forces him to regulate his use of the Roar.
298* This whole trope was [[AnAesop the moral]] of the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' episode "[[Recap/MyLittlePonyFriendshipIsMagicS3E4OneBadApple One Bad Apple]]." [[LampshadeHanging Lampshaded]] by [[MetaGuy Sweetie Belle]].
299--> '''Sweetie Belle''': Why does life have to be so ''ironic?!''
300* ''WesternAnimation/{{The Powerpuff Girls|1998}}'' become this in "Candy Is Dandy." They strike a deal with Mojo Jojo to get an endless supply of candy, but when the candy gives out, they beat Mojo to a pulp like they never had before. It's Blossom [[MyGodWhatHaveIDone who finally realizes this]], the girls becoming as bad as the villains they fight over a candy addiction.
301* On ''WesternAnimation/ReBoot'', little Enzo Matrix never took the presence of LawfulEvil Megabyte ''too'' seriously, until Megabyte finally took over Mainframe, exiled TheHero, Bob, into the WWW and pushed Enzo into despair until he was trapped in games. When Enzo came back ''much'' older and ''much'' more serious, he's willing to execute viruses in cold blood and killing Megabyte was all he could think of. In the episode "Number 7," he ended up in a simulation of Mainframe, where he rebooted in Megabyte's body and easily played the part unconsciously. That same episode also shows that Matrix suffers from a ''lot'' of self-loathing over what he's become and fears he's truly become a monster like Megabyte. [[spoiler:Ultimately, Matrix is able to calm his rage enough to decide Megabyte was NotWorthKilling.]]
302* ''WesternAnimation/RobotChicken'' does an extrapolation of ''Film/RevengeOfTheNerds'' and points out how what the Nerds do is worse that what was done to them, and that what they did was in fact illegal.
303* ''WesternAnimation/TheSimpsons'':
304** Played surprisingly straight in the ''[[Recap/TheSimpsonsS18E11RevengeIsADishBestServedThreeTimes Revenge Is a Dish Best Served Three Times]]'' segment "Revenge of the Geeks", in which, the Elementary School's group of nerds, tired of being bullied, created a weapon and gave it to Milhouse, since he's the only one with hand-eye coordination. At first, he uses the invention to get back at the bullies, but then he started to use it on anybody who wronged him in the past, to the point of becoming a bully himself. Lisa, who was narrating the story, says that the aesop of the story is that revenge can make you as bad as the people who harm you. (Homer, however, [[AlternateAesopInterpretation interpreted it as "Never put down your weapon."]])
305** Lampshaded in "Sex, Pies and Idiot Scrapes," where Homer and Ned become bounty hunters and Homer scolds Ned for "not becoming as bad as the people they were hunting."
306* ''WesternAnimation/SouthPark'' loves this trope. In one particular episode, in order to keep [[ItMakesSenseInContext tomato Kenny]] alive, Stan and Kyle enlisted the Republicans, and showed Kenny on national TV like that...only to learn that his last wish, if he were ever hooked up to a feeding tube, was "...for the love of God, don't show me on national TV like that.". {{Downplayed|Trope}}, since this was an accident; the rest of their methods weren't that bad and they still had good intentions.
307** [[Characters/SouthParkKyleBroflovski Kyle Broflovski]] gets this most, considering his personal hatred for Cartman (not that Cartman's actions make it any less justifiable). Episodes such as "Fatbeard" display his borderline murderous vendetta against him.
308*** In earlier season it was implied that [[Characters/SouthParkEricCartman Eric Cartman]] became such a {{Jerkass}} because he was constantly bullied for his weight. "Cartman's Silly Hate Crime 2000" goes so far to imply that Clyde almost underwent the same evolution after the boys turned their attention onto him instead, even taking on some of Cartman's obnoxious attributes.
309** The episode "Butterballs" depicts anti-bullying advocates as being no better that those they are fighting against. Or the people that eventually advocate against them... and those that advocate against ''them''...
310* ''WesternAnimation/SpongeBobSquarePants'':
311** In the pre-movie seasons, [[Characters/SpongeBobSquarePantsMrKrabs Mr. Krabs]] was originally the BigGood to Plankton's BigBad, simply defending his business against Plankton's {{Evil Plan}}s. Post-movie, due to {{Flanderization}}, he's often shown to be just as evil and cruel as Plankton, if not worse, and often makes it his personal duty to sabotage Plankton when he's making legitimate profits or simply isn't miserable. In "The Krabby Kronicle," ''Plankton himself'' is actually disgusted at how low Krabs would stoop to make money:
312--->'''Plankton''': And I thought ''I'' was evil!
313** Compared to [[Characters/SpongeBobSquarePantsSquidwardTentacles Squidward Tentacles]], who openly hates [=SpongeBob=] and doesn't bother hiding it, Mrs. Puff was a docile, well meaning character whose nerves have slowly been worn at by [=SpongeBob=]'s antics. Several episodes have shown her take increasingly desperate and sometimes unscrupulous measures just to finally get away from him and in one episode, she outright tried to ''murder'' him.
314* Bismuth from ''WesternAnimation/StevenUniverse'' is this due to her making a weapon designed to kill her enemies (Homeworld Gems) with has plans to commit genocide against them and will destroy anyone who stands in her way (even allies), thus becoming as bad as the Homeworld Gems she fights against who have done the same against their enemies and allies.
315* ''Franchise/TomAndJerry'': On the rare occasion that Jerry loses to Tom, this trope is often his undoing, being so set in his vendetta against Tom that he'll attack him beyond provocation or even draw the first blow.
316* Depth Charge in ''Franchise/{{Transformers}}: WesternAnimation/BeastWars'' snubbed most of the Maximal cast to continue his hunt for Rampage, who had murdered the colony he was supposed to protect beforehand. The one time he decided ''not'' to put his vendetta before an important mission, he was ambushed by his prey, and chose to finish him off in a suicide attack rather than return to his duty. Being frequently AWOL allowed him to pull off several BigDamnHeroes moments, but that doesn't excuse his not being there fighting in the first place. He also utters this trope's StockPhrase word-for-word: "It's not revenge I'm looking for, it's justice." Depth Charge even went head-to-head with Optimus over it, when he showed no remorse at Cheetor's death and didn't care about what really happened to him. Optimus-fucking-Primal had to threaten him with a lobotomy to get an answer and some respect. Once Depth Charge opened up a bit, he revealed a fondness for Cheetor.
317** Let's also throw in the Maximal government; they locked down all information and locations related to the Great War, Big Brother style, they experimented on their own citizens in order to copy a condition in a ''Decepticon's'' spark that rendered it immortal (resulting in the creation of Rampage and the atrocities he committed, above), and their treatment of the Predacons is very much like the treatment of the Allies towards post-World War I Germany. All in the name of keeping the peace and not letting the atrocities of the past come back to haunt Cybertron again.
318** [[BigBad Megatron]] himself is this in several continuities, such as most of the comics series, ''Beast Wars'', ''WesternAnimation/TransformersAnimated'' and ''[[WesternAnimation/TransformersPrime Prime]]'', usually getting his start fighting against an oppressive and unjust Autobot/Maximal regime, and then going more mad and power-hungry than the guys he rebelled against.
319* The seeming moral of the animated short "[[https://www.youtube.com/watch?v=jJ-n72sADsg Who's Afraid of Mr. Greedy]]"
320* This is why the WesternAnimation/WinxClub has so many problems with how Nebula and her Warrior Fairies go about fighting with the Wizards of the Black Circle, believing that vengeance will make them no better than their enemies. (The Winx want to stop the Wizards, too, but disagree with the Warrior Fairies' methods.) [[spoiler:Aisha]] rejects the Winx after the death of [[spoiler:Nabu]] when they still believe that acting out of vengeance would make them just as bad as the Wizards. Nebula finally realizes how far she has fallen, from Fairy of Peace to Fairy of War, she tells the others to leave her to presumably die as they flee a destructing planet.
321[[/folder]]
322
323%% No Real Life Examples Please. That would be just be asking for an Administrivia/EditWar.
324----
325->''Don't like it so much, now that the boot's on the other foot?''

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