->Why the Hell is [the ObviouslyEvil demon] slaughtering us for? '''WE ARE THE BAD GUYS!!!"'''
-->-- '''Lilah''' [[VillainousBreakdown having a bad day at the office]], ''Series/{{Angel}}''

->When there is evil in this world that justice cannot defeat, would you taint your hands with evil to defeat evil? Or would you remain steadfast and righteous even if it means surrendering to evil?
-->-- '''Lelouch Lamperouge''', ''Anime/CodeGeass''

->You think that there are the good people and the bad people. You are wrong, of course. There are, always and only, the bad people, but some of them are on opposite sides.
-->-- '''Patrician Havelock Vetinari''' of Ankh-Morpork, ''Discworld/GuardsGuards''

->'''Cybermen:''' Our technologies are compatible. Cybermen plus Daleks: together, [[WeCanRuleTogether we could upgrade the universe]].\\
'''Dalek Thay''': You propose an [[VillainTeamUp alliance?]]\\
'''Cybermen:''' This is correct.\\
'''Dalek Thay''': Request! Denied!\\
'''Cybermen:''' Hostile elements will be deleted! ''(They open fire... [[ShootingSuperman to no effect]])''\\
'''Dalek Thay''': EXTERMINATE!
-->-- ''Series/DoctorWho'', "Doomsday"

->When evil fights evil, good triumphs - usually. In the battle between Vecna and Kas, though, the ultimate victor might have been evil. While the battle destroyed a particularly loathsome empire, it also resulted in the creation of three powerful artifacts.
-->-- ''[[TabletopGame/DungeonsAndDragons Dungeon Master's Guide II]]''

->Only through victory can the galaxy be saved from extermination, so that it can be enslaved, and oppressed, as is proper.
-->-- ''VideoGame/GalacticCivilizations II: Dark Avatar'' intro

->'''[[WebVideo/TheAngryJoeShow Angry Joe]]:''' Sometimes the best way to deal with a madman is to send in another madman...\\
'''[[WebVideo/AtopTheFourthWall Linkara]]:''' ''(thinks for a second)'' That is a stupid plan!\\
'''Angry Joe:''' Exactly! A stupid plan for a stupid man!\\
'''Linkara:''' Are you high?
-->-- ''WebVideo/{{Kickassia}}''

->Have you ever heard a foolish old saying that evil can only be conquered by good? It's a lie. Evil can only be conquered by evil.
-->-- '''Welstiel Massing''', ''[[Literature/TheSagaOfTheNobleDead Dhampir]]''

->'''Demon''': You cannot hope to defeat pure evil!\\
'''Slade''': Actually, I'm not such a nice guy myself.
-->-- ''WesternAnimation/TeenTitans''

->'''Yugi:''' Look! Kaiba's dueling Pegasus!\\
'''Joey:''' But they're both villains! Who're we supposed to root for?
-->-- ''WebVideo/YuGiOhTheAbridgedSeries''

->It's a pity they both can't lose.
-->-- '''Henry Kissinger''', on the UsefulNotes/IranIraqWar