A villain who has an overall goal which the heroes can appreciate in principle, but whose methods of pursuing said goal (such as mass murder) are problematic; despite any sympathy they may have with their cause, the heroes have no choice but to stop them. Taken to extremes, they may fully believe that Utopia Justifies the Means. Such an idealistic extremist is likely to be either a Totalitarian Utilitarian or a Principles Zealot, depending on whether they’re aiming For Happiness or For Great Justice. The most well-written examples of this trope are the kind that the reader/viewer stops just short of agreeing with.
Other times, the villain may be out for simple revenge against a person or corporation or other entity that has undeniably wronged them. Again, the heroes may sympathize with their plight, but are obliged to stop them because they care not who gets in the way of their planned revenge. However, the heroes will often investigate the villain's grievance themselves and will complement stopping the villain with taking down the offending party as well.
Maybe they started out with actions as good as their intentions, but were forced to take more extreme measures. Either way, it's a common end result of Jumping Off the Slippery Slope. Their favorite phrase is I Did What I Had to Do.
On the extreme end, may result in the even darker Knight Templar who chooses to either remove free will, believing it the best way to save the world or destroy whoever they don’t consider worthy enough to live. Unlike this, The Well-Intentioned Extremist isn't a punisher of all flaws or a dictator who argues that they are good and therefore everyone else is bad; they actually realise that some of their victims don't deserve to die or suffer, but insist that it is for the greater good and actually isn't entirely wrong. They could also be a fallen Wide-Eyed Idealist that was driven over the edge, and sometimes a Worthy Opponent or even Reluctant Warrior. Vigilante Man is a case where the Well-Intentioned Extremist hasn't (yet) descended to the point of not caring who gets hurt. Often ends up in rivalries with the Knight In Sour Armor. Maybe they're Obliviously Evil and don't realise they're the bad guy, in which case they're prone to My God, What Have I Done? and becoming wracked with guilt and horror if they're ever enlightened. Some of those seeking to bring about a One World Order to end international strife may count as this.
This can be a difficult line to walk: push too hard in one direction and you make it seem as if the extreme methods are acceptable; push too hard in the other and you run the risk of denying the validity of their initial cause, of arguing for oppression (for instance) instead of against it. When the balancing is done they more often than not tend to be either Anti-Villains or even dark Anti-Heroes, especially if put more emphasis on the "well-intentioned" part than the "extremist" one. However there are some who seem like ones but in reality are just straight-up villains, particularly if they are the other way around in terms of what they put more emphasis on and if they are obviously just using their philosophy as a shallow excuse to commit evil. Another version of a darker villain being this trope is that they have an actual philosophy which they believe will "improve" the world but the philosophy itself is too obviously evil to garner any sympathy, such as is often the case with the Misanthrope Supreme and genocidal maniacs.
Often, these characters are presented as more dangerous and terrifying than some who are straight-up For the Evulz and Take Over the World types and with good reason: Even Evil Has Standards does not usually apply to them, as it might be for some others. After all, if you think you're doing the right thing, then it's easy to consider even the most horrific actions an acceptable compromise.
Compare with Necessarily Evil, where the villain in question has a Heel Realization and recognizes that he deserves punishment (of course, he may always choose to just Ignore That Epiphany). See also A Lighter Shade of Grey. A staple trope of the Master Computer gone mad. If the positive intention is overthrowing an evil government, the Well Intentioned Extremists will be an example of The Revolution Will Not Be Civilized. If the positive intention is helping a friend- realizing things that said friend sees as immoral- the Well Intentioned Extremist will be an example of Poisonous Friend. If his extremism actually succeeds in making the world a better place, it's The Extremist Was Right. The Small Steps Hero desperately wants to avert this trope. The Not-So-Well-Intentioned Extremist has no such convictions.
As this trope often goes hand-in-hand with the Face–Heel Turn or may involve the reveal of a villain's true plans (or intentions), expect spoilers.
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- Simon Dean is tired of traveling this country and seeing so many fat monstrosities. So he is going to help solve the problem by selling his patented Simon System at a discount. Because even though he does not like you, Simon Dean believes in you!
- Stevie Richards in TNA, trying to save the world from Abyss, and Abyss from himself, turned out to be worse than Abyss by the end of their feud.
- Coming out of left field, "The World Famous" Kana, then on a mission to defeat Yoshihiro Tajiri and all the other "old men" of his SMASH promotion, wrote a "manifesto" on the Joshi half of Puroreso, emphasizing, among other things, a need to isolate every wrestler and dump the worthless ones after evaluating them all.
- Jessicka Havok has always been a menace to WSU, but was cast in a new "heroic" light after DJ Hyde took over the company and proclaimed not only her but many others who were long time fan favorites Persona Non Gratanote . Since Havok did not care about WSU rulings to begin with, she continued to show up anyway and do what she does, to cheers. Jessicka's also fond of the Shine promotion, admitting that she had consciously not stooped to her usual lows while working there, not complaining when punished by officials for her post match rituals and attacking those who she feels are bad for the promotion or disrespectful to it, though she ignored the Legion of Doom who were guilty of every "crime" she charged all her other targets with because Allysin Kay, Havok's best friend from WSU, was a part of it.