[[quoteright:350:[[VideoGame/MedalOfHonor http://static.tvtropes.org/pmwiki/pub/images/1286384777089_4494.png]]]]
[[caption-width-right:350:[[FlatWhat ...What.]] ]]
->''"Si vis pacem para bellum"''\\
--'''Latin adage''', translated as "If you wish for peace, prepare for war"

So, you have an idea, it's beautiful and you want to fulfill it. Let's say, for example, you want peace. So, how are you going to fulfill it? Fight a war.

Put it basically, you're doing the exact opposite of what you're trying to fulfill.

This comes in two setups, but leads down to the same point:
# You want to fulfill X, so you do Y, which is completely opposite to X. (the page quote)
# You want to stop X, so you do X. (For example, you want to stop war, so you start a war, so when you finish it, you can disarm everyone)

As [[LogicBomb hypocritical]] as it may sound, sometimes this is the only possible choice, and some people will [[HypocrisyNod even acknowledge it]].

Some will know this with the phrase "Fight fire with fire", which this trope is (in Setup 2), but this trope also includes the ideology of the action, not just the methods alone, but, of course, it's not totally necessary to have the ideology to back it up.

Compare TurnTheOtherCheek, when allowing someone to hurt you can be a BadassPacifist tactic that stops them from hurting you.
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!!Example:

[[foldercontrol]]

[[folder: Anime & Manga ]]

* Many ''Franchise/{{Gundam}}'' villains.
** The protagonists of ''[[Anime/MobileSuitGundam00 Gundam 00]]'' seek to end global conflict by attacking anyone who causes military aggression.
** ''[[Anime/MobileSuitGundamWing Gundam Wing]]'' has Zechs desire to cause such intense devastation to Earth that war loses all appeal. In [[TheMovie Endless Waltz]] this is partially the reason Wufei switches sides and fights against the Gundam Pilots, which is explained more in supplimentary materials.
** ''[[Anime/MobileSuitGundamAGE Gundam AGE]]'' has Lord Ezelcant decide to end war forever by... staring a huge war. [[spoiler:His SocialDarwinist agenda is even worse. He wants to purge humanity of warlike tendencies. Except the people who live through wars and disasters tend to be the ones who ''fight the hardest'' to survive.]]
* ''Manga/{{Bleach}}'': During the Blood War arc, it's revealed that Quincy have [[spoiler:developed a way to seal a shinigami's final release (or "bankai"). To test its capabilities, several captains allow their bankai to be sealed... except that the Quincy actually ''[[PowerParasite steal]]'' [[PowerParasite the bankai]] and use them against their owners. Worse still, when Kisuke Urahara found a way to [[AssimilationBackfire turn the stolen bankai against the Quincy that stole them]], thereby not leaving the Captains at a horrible disadvantage, it was then revealed that having stolen bankais also functioned as a PowerLimiter, preventing the use of the Quincy Vollständig. The advantage they got back was pretty much nullified on the spot.]]
* ''Franchise/CodeGeass'' plays this one very straight. Early in the second season, [[DarkMessiah Zero]] publicly admits that he [[NecessarilyEvil became evil because he was convinced it was the only way]] to defeat the evil Britannian empire.
* Pain from ''Franchise/{{Naruto}}'', who wants to end all wars by giving people the ultimate weapon of mass destruction.
** "Salamander" Hanzo, a legendary shinobi with a reputation as TheDreaded, claimed his warmongering ways sprang from an attempt in his youth to unite the land under him. This is a case that doesn't work as well as Pain's; while Pain based his plan on human nature and acknowledged a lot of people would die in cycles because of it, war would become unbearable as long as his weapon existed and long periods of peace would be possible. Hanzo's wars just made the division in the shinobi world worse (since he lost interest in his original ideals early on and became a paranoid monster that oppressed his people) and was actually directly responsible for driving Pain insane in the first place.
* ''LightNovel/CrestOfTheStars'' The Ahb take the position that humanity will be inevitably be destroyed in a galactic war if left to themselves. So they decide to conquer everyone and incorporate them into their Empire, denying all other races the ability of hyperspace travel so that there won't be any war. Tactics used to accomplish this salvation include blowing away the atmosphere of rebellious planets. And they're the ''protagonists''!
* Light Yagami of ''Manga/DeathNote'' commits mass homicide in order to put an end to all crime.
* In episode 21 of ''Anime/GenesisOfAquarion'', Sirius declares that "the reason I fight is to create a world free of fighting, where beauty prevails."
* Paradox from the ''Anime/YuGiOhTenthAnniversaryMovie'' wants to use Duel Monsters to Stop Duel Monsters from being made.
* Chris from ''Anime/SenkiZesshouSymphogear'' uses her heavily armed PoweredArmor to end wars and fighting by beating thouroughly anyone armed at all.
* In ''Manga/MahouSenseiNegima'', the group "Perfect World" wants to save the MagicWorld from its inevitable impending collapse by destroying it first, sending all its inhabitants to their "perfect world" that is suspiciously afterlife-like.
* The [[AbsurdlyPowerfulStudentCouncil Miyaji High Student Council]] employs this strategy against the unwanted Miyaji Cardfight Club in [[Anime/CardfightVanguard Cardfight!! Vanguard]]. By sending "assassins" against said club, they hope the club will cease to exist once they beat them in their own game. Needless to say, this has yet to succeed, prompting the vice president to take more extreme measures in sabotaging.

[[/folder]]

[[folder: Comic Book ]]

* ''ComicBook/{{Watchmen}}'': in order to stop people from killing each other, [[spoiler:make it look like an outside force (aliens) are going to attack them. By killing a whole lot of people]].
* ''ComicBook/DCOneMillion'': in order to stop [[spoiler:Solaris's]] plot to destroy the past, the heroes have to [[spoiler:build him]].
* In ''ComicBook/{{Hellboy}}'', a sea-witch captures Hellboy and plans on killing him because she's afraid someone will take his [[TheRightHandOfDoom Right Hand of Doom]] and use it to destroy the world. This gets lampshaded by Hellboy himself.

[[/folder]]

[[folder: Fan Works ]]

* In the ''Manga/DeathNote'' [[AlternateUniverseFic AU]] ''Fanfic/ThoseWhoStandForNothingFallForAnything'' Light becomes a CorruptPolitician in order to put an end to corruption.

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[[folder: Film ]]

* In ''Film/DemolitionMan'', cop 20th century John Spartan is thawed out in the future to catch 20th century criminal Simon Phoenix on the basis of "Send a maniac to catch a maniac."
* The BigBad of ''MissionImpossibleGhostProtocol'' is a nuclear weapons specialist who is convinced that mankind will keep building more and more powerful weapons until it inevitably wipes itself out in nuclear war. So he seeks to prevent this by...starting nuclear war RIGHT NOW and hoping that enough of mankind survives to create a WMD-free society.

[[/folder]]

[[folder: Literature ]]

* ''Literature/{{Frindle}}'' combines this with ReversePsychology. A young boy is trying to popularize the term "frindle" as an alternative for "pen," [[spoiler:and a disliked teacher is secretly rooting for his act of rebellion, but she doesn't think he has much of a chance on his own. She therefore [[StreisandEffect bans the use of the word in school, so that the other students will use it as a way of spiting her]].]]
* Literature/TheWheelOfTime: Throughout the series, the characters have been trying to prevent the [[BigBad Dark One]] from breaking free of [[SealedEvilInACan his prison]]. In the twelfth book, it's revealed that [[spoiler: in order to keep the Dark One sealed away, they first need to break the seals on the prison, so they can remake the seals even stronger.]]
* In the Literature/{{Dragaera}} series, we learn that the Morganti weapons, which devour the souls of their victims, were created by the Serioli to make war so horrible that no one would ever fight again. It worked... but only for the Serioli, who have a very alien way of thinking. Dragaerans and Easterners don't have the same level of conscience that would restrain them from destroying a soul.
* Subverted in ''Discworld/{{Jingo}}'', where Vetinari sees the Klatchian empire is remarkably well prepared for a conflict that supposedly flared up only a few days ago, noting: "If you want war, prepare for war." When Leonard corrects him with the page quote, Vetinari thinks about it and says he doesn't see it.
* The protagonist of ''The Janson Directive'' muses upon this concept (with regards to American foreign policy).
* In ''The Literature/MistbornTheOriginalTrilogy'' Elend who is fighting for the freedom and rights of the people [[spoiler: ultimately declares martial law and seizes absolute power in order to ensure the survival of his people. He determines that he'll do anything to ensure the survival of his people even if it means he's seen as the next [[EvilOverlord Lord Ruler]].]]

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[[folder: Live Action TV ]]

* In one episode of ''Series/StarTrekTheNextGeneration'', a scientist is trying to convince the Federation that [[FasterThanLightTravel warp drive]] is dangerous, and is damaging space (using similar arguments to how real life greenhouse emissions are damaging Earth), which is particularly bad around her planet since it's a major shipping lane. In order to try to convince the Federation to stop using warp drive, she intentionally self-destructs her ship's warp drive in order to ''cause'' the very damage she was trying to prevent, just to prove her point. As a result of the episode, the Federation begins research into safer drive systems; in the meantime (as a stopgap measure), an order is issued to all Federation ships to restrict travel to warp 5 for non-emergency situations.
** Which is never mentioned again in all subsequent episodes. StatusQuoIsGod
** It's revealed that Voyager and other later designs for starships have the non-subspace damaging warp drives, dealing with the issue this episode brought up. However, it's AllThereInTheManual.
* Crichton of ''Series/{{Farscape}}'' showcases just how destructive wormhole weapons are so everyone would stop trying to bully, blackmail, threaten and MindRape the secrets out of his head.
* In the ''Series/StarTrekTheOriginalSeries'' episode "A Taste Of Armageddon", two planets fight a "clean" war by having computers figure out who was killed by each virtual attack, whereupon the designated casualties report for [[NeverSayDie termination]]. Kirk destroys the computers on one side, forcing them to choose between fighting war in the usual messy manner or making peace.

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[[folder: Tabletop Games ]]

* In ''TabletopGame/ArkhamHorror'', the spell "Call Ancient One" allows you to awaken the Ancient One instead of waiting for him to awaken on his own. The reason to do this is that you want to fight him at a time of your own choosing, when you know that you have the firepower to [[DidYouJustPunchOutCthulhu punch out Cthulhu]]. Works better against some Ancient Ones than others.
* Many members of the Boros Legion in ''TabletopGame/MagicTheGathering'' are dedicated wholeheartedly to the cause of stopping Guild violence with, um, more Guild violence.
* {{Warhammer}}: Vampire lord Carstein's master plan to prevent Chaos from taking over the world is to kill everyone and raise them as zombies. No emotions, no Chaos.

[[/folder]]

[[folder: Video Games ]]

* Most of the ''VideoGame/QuestForGlory'' games require you to play UnwittingPawn to the villain's scheme before you can put an end to that scheme. In the second game, this is actually in force by your enemy, who needs "A hero from the north" to fulfill a prophecy, and so send the elementals to test you[[note]]In addition to providing a test of your abilities, it's also designed to get you to a specific place, at a specific time, with a ''specific title'' (Hero). Not knowing that you're a hero from Spielburg, the BigBad plots to ''make you'' a hero, so that you can fulfill a prophecy for him. The only reason he fails is because he didn't know the full, real prophecy[[/note]]. In the third game, you're trying to avert a war between the Leopardmen and the Tribal People, but the only way to discover who's trying to incite the war is to let the war actually happen[[note]]Though you don't know that at the time. The majority of the game is spent trying to get a peace conference between the two groups, and when you ultimately succeed, the demons behind the plot are forced to intervene directly, giving evidence of their previously-unconfirmed involvement and setting you on the path to confront them[[/note]]. In the fourth game, the BigBad plots to unleash an otherworldly Old God that was partially summoned years ago (and the partial summoning is responsible for the sorry state of the surrounding countryside), and to permanently banish the Old God, the hero has to (unwittingly) finish summoning it[[note]]Though in this case, the reason the Old God must be summoned is because the only person capable of banishing it completely was trapped with the Old God in a partial banishment, preventing either from gaining an advantage[[/note]].
* The Maymai Alliance in ''Spectral Force Genesis'' wants to stop a war that will ravage the land, but to do it, they'll beat everyone else and then disarm them all.
* In ''VideoGame/AssassinsCreedII'', one of Altair's Codex pages lists what he considers the three ironies at the heart of the Assassins - They seek peace, which they try to obtain through murder. They seek to free the minds of men, but require obedience to a leader and a set of rules. They seek to expose the dangers of faith, but use it themselves. He goes on to say that he is trying to find a way to resolve the contradiction but fears that no solution exists.
* ''VideoGame/GoldenSun'': Restoring Alchemy might destroy the world, and will most likely cause wars. Not restoring Alchemy will destroy the world eventually.
* ''VideoGame/GearsOfWar 2'': To stop the Horde from sinking humanity, Marcus and Dom decide to [[spoiler: sink Jacinto faster to take them out, too]].
* ''VideoGame/FinalFantasyVIII'', of course, features the master plan to prevent [[spoiler: Ultimecia from compressing time]]: Let her [[spoiler: compress time]] and jump her ass while she does that.
** In ''VideoGame/FinalFantasyX'', Maester Seymour believes that the [[EldritchAbomination otherwordly entity Sin]] has trapped the world of Spira in a downwards spiral of death and suffering. How will he save Spira's people from this sorrow? [[spoiler: by becoming Sin himself and ''[[PutThemAllOutOfMyMisery killing everyone on the face of the planet]]'']].
* ''VideoGame/PokemonMysteryDungeonExplorers'': Stop time to stop time from stopping.
* Fight, ''VideoGame/MegaMan''! For everlasting peace!
** What's the best weapon to defeat Metal Man? [[HoistByHisOwnPetard Metal Man's own weapon, of course!]]
* In ''JustForFun/PokemonVietnameseCrystal'', a TranslationTrainWreck of ''Pokemon Crystal Version'', you apparently have to pull the power supply out to start up the PC.
* ''VideoGame/PokemonBlackAndWhite'': Team Plasma wants all Pokemon to be released into the wild, and they'll use their Pokemon to force you to give them up.
* ''VideoGame/MeltyBlood'': [[TimeTravel Dust of Osiris]]' plan to defy the end of humankind's existence is by ending humankind's existence and leave behind a record of some sort.
* In the ''Franchise/MassEffect'' series, the true reason the Reapers cull organic life in the galaxy every 50,000 years or so? [[spoiler:It was the answer their creator the Catalyst, the first true Artificial Intelligence ever created, came up with to its creators the Leviathans' question of how to prevent synthetic life from wiping out organics. The Catalyst believed that organics would inevitably create synthetic life and just as inevitably come into conflict with it. Such a RobotWar could wipe out life in the galaxy forever. To prevent this, the Reapers wipe out the most advanced races before they create synthetic life, leaving the less advanced species alone. In the process, they preserve said races by using their genetic material to create new Reapers and continue their own genocidal cycle.]]
* ''VideoGame/StarCraftII'': [[spoiler:The Overmind]]'s idea: start a genocidal war to stop a genocidal war. [[spoiler:It seeks someone strong enough to take over the Zerg Swarm, lest the Zerg Swarm will eventually be mind-slaved by the Xelnaga Amon]]. Amazingly, this plan seems to be working in its favor despite everything.
* ''VideoGame/MetalGearSolidPeaceWalker'': Hot Coldman turns out to be a complete nutbar who believes that nuclear deterrence is doomed to fail because no one has the guts to return fire. So his solution is "nuke everyone so no one can nuke anyone".
* ''VideoGame/MetalGearRisingRevengeance'': The goal of the VisionaryVillain in an age where the world is hooked on a global war economy: ''"You still don't get it. I'm using war as a business to get ELECTED! So I can end war as a business."'' Raiden predictably finds this [[YoureInsane completely ridiculous]].
* Lloyd and co from TalesOfSymphonia, after discovering where [[PoweredByAForsakenChild Exspheres come from]], resolve to stop the Desians [[spoiler: and Cruxis]] and stop the manufacture of Exspheres. However, they quickly realize afterwards that, in order to even stand a chance against them, they have to keep using their own Exspheres anyway. [[spoiler: The party continues to use theirs after the game, while planning to give them up after Lloyd finishes his quest to gather every Exsphere on the planet.]]
* In ''VisualNovel/NineHoursNinePersonsNineDoors'' [[spoiler:Past!Akane is trying to survive a Nonary Game. To this end, she causes a time paradox, shifting her consciousness into the future...where she creates ''another'' Nonary Game and risks people's lives to make them play it.]] ItMakesSenseInContext, but it's still morally questionable enough to make [[spoiler:her]] the BigBad.

[[/folder]]

[[folder: Web Original ]]

* Parodied in ''WebVideo/ToBoldlyFlee'' when [[Film/SupermanII General Zod]] takes control of [[Film/BattlefieldEarth Terl's]] operation to kill WebVideo/TheNostalgiaCritic (who's turned his house into a spaceship). He quickly decides that the best way to fight the Critic is to turn Terl's own CoolShip into a house.

[[/folder]]

[[folder: Webcomics ]]

* Janis from ''Webcomic/{{Erfworld}}'' is a Hippymancer who wants to see Erfworld at peace. She's become convinced that this won't happen until [[http://www.erfworld.com/book-1-archive/?px=%2F141.jpg things get broken even worse than usual]].
-->"Lord Parson doesn't want to lead it. I respect him for that, but I'm also really quite frightened about what will happen to the whole world if he takes command again."\\
One corner of Janis' mouth drooped, and she touched his shoulder.\\
"It will break. I told you. He may war so terribly that it breaks war itself. That is my own hope." She smiled sadly, "And in the long run, I have few others."

[[/folder]]

[[folder: Western Animation ]]

* In the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' episode "[[Recap/MyLittlePonyFriendshipIsMagicS2E3LessonZero Lesson Zero]]", Twilight Sparkle [[SanitySlippage literally goes crazy]] with worry about not turning in her weekly friendship report to Princess Celestia on time and, after failing to find a problem to solve, decides "If I can't ''find'' a friendship problem, I'll '''''make''''' a friendship problem!"
** The episode "[[http://tvtropes.org/pmwiki/pmwiki.php/Recap/MyLittlePonyFriendshipIsMagicS2E20ItsAboutTime It's About Time]]" has Twilight get a visit from her future self which makes her think that there is going to be a terrible calamity by next Tuesday. The episode has her growing increasingly frantic and sleep-deprived, trying to figure out what this calamity ''is'' so that she can stop it. Finally, she gets so desperate that she decides the only way to prevent whatever is going to happen is to find a spell to stop time itself, so that next Tuesday can never come. [[spoiler:The big punchline to the episode is that there never was any future calamity on its way, and the whole plot was kicked off by a StableTimeLoop caused by 'future' Twilight going back to the past in a failed attempt to tell herself not spend the next week freaking out.]]
* An episode of ''WesternAnimation/KungFuPandaLegendsOfAwesomeness'' has Po consider releasing a SealedEvilInACan so he can defeat it and restore his fan club's faith in him. After a brief ImagineSpot he opts against it, but then accidentally releases it when he drops the jar it was in.
* The episode "Jet" of ''WesternAnimation/AvatarTheLastAirbender'' features one rather similar to the Vietnam situation in the RealLife section. An Earth Kingdom village has been taken over by the Fire Nation, and the rebels are determined to save it. Their solution? Blow up the dam and kill everyone in the village.
* At the end of season 3 of ''WesternAnimation/{{Reboot}}'', Mainframe is falling apart thanks to Megabyte's reign. When a Game approaches, Bob decides to let it crash the system instead of play it. Mainframe is too far gone for system repairs -- their only recourse is the User rebooting the system after it crashes. To save Mainframe, they have to let it and everyone in it die first.

[[/folder]]

[[folder: Other ]]

* Windows 95 and later: click the Start button to Shut Down the computer.

[[/folder]]

[[folder: Real Life ]]

* WorldWarI's description as "The War to End All Wars" sounds like an example, but in reality peace wasn't the goal of the instigators. The term comes from the vain hope of the survivors that its horrors would put people off warfare for good. [[WorldWarII Obviously that didn't come to pass.]]
* Peter Arnett quoted a United States major as saying, "It became necessary to destroy [[http://en.wikipedia.org/wiki/B%E1%BA%BFn_Tre the town]] to save it."
* Mao Zedong's defining phase, "political power flows out the barrel of a gun" came from this passage: (''Selected Works of Mao Tse-tung, Vol. II'', pp. 224-225)
-->[O]''nly with guns can the whole world be transformed. We are advocates of the abolition of war, we do not want war; but war can only be abolished through war, and in order to get rid of the gun it is necessary to take up the gun.''
* Practically all any recent war is generally claimed to be needed to ensure peace for the country starting it. Most leaders don't get away anymore by announcing a war for [[WarIsGlorious glory]] or [[WarForFunAndProfit financial gain]]. One of the well-known protest-signs against the war in Iraq read "Bombing for peace is like fucking for virginity" and a common rebuttal reads "How else do you make more virgins?"
* Back-fires are controlled fires used to stop the progress of an uncontrolled one (by using controlled fires to consume the fuel for the uncontrolled fire), and the origin of the phrase "fight fire with fire."
* The page quote was used in a more pithy form by Cromwell's English republic as its motto - ''Pax Quaeritur Bello'', or "Peace is sought through war".
** Said page quote is also a poor example of the trope; the idea is that if your country is militarily weak, you'll be attacked by opportunistic neighbors. So if you want peace, build up a strong enough military that those neighbors will think twice about attacking you. Result: peace, not from ''starting'' a war (which ''would'' be this trope), but by merely being ''prepared'' to fight a war, even though you have no intention of starting one.
** "It takes two people to make peace, but only one to start a war"
*** Not according to Clausewitz: it takes one to decide to attack, but there's only a war if the attacked party decides to fight back. Both parties have to agree to fight for there to be a war.
* Bruce Hoffman suggested in his 1998 book ''Inside Terrorism'' that the trend of escalating violence would soon lead to an act of terror so awful that the world's sympathies would turn against the perpetrators. Terrorism would get so [[MyGodWhatHaveIDone horrific]] that terrorists would abandon it. It hasn't happened yet.
** On a small scale though, the US forces in Iraq began to have a bit more success against the foreign jihadists in the mid-2000's when their acts of terrorism became so brutal that the local armed rebels got sick of them and began opposing them.
* Unstable negative feedback processes, instead of steadily self-regulating, can sometimes turn into this.
* It is common for bomb squads to deal with a suspicious package or bag that might be a bomb by blowing it up in a controlled explosion.
* A certain logic problem revolves around this. You're stranded on an island covered entirely with a forest. A lightning strike starts a fire at one end of the island, and the wind is causing the fire to slowly spread across the rest of the island. How do you survive? [[spoiler:Pick up a branch from the underbrush in the forest, go near the fire and light the stick. Run to the other end of the island and light the forest on fire there. It will burn out soon, as it can't spread against the wind. You can then use this burnt-out section as a safe spot when the main fire comes.]]
** Additionally, this is done by firefighters to create firebreaks during forest fires, with the added caveat that the main fire is so hot it will burn against the wind/downhill/etc.
** This is also periodically done to ''prevent'' major fires, by creating low-intensity fires to burn off much of the dry undergrowth and dead foliage that contribute to major fires. Sometimes these controlled burns [[NiceJobBreakingItHero get out of control]], making it a controversial tactic.
** And ''inverted'' when naturally occurring fires are stamped out early, meaning that the underbrush does ''not'' get burned off naturally. Eventually a fire starts in such a fuel-rich environment and rapidly grows into a huge blaze.
* [[http://en.wikipedia.org/wiki/Reactive_armour#Explosive_reactive_armour Explosive Reactive Armour]] attached to armoured fighting vehicles uses one explosion to neutralize another explosion in Anti-Tank warfare.

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