villainous progressives—utopian dreamers who want to change the world for the better, and end up just slaughtering people.

the best villains in fiction are
always heroes of their own story, doing what they think is right and being dead wrong about it
cackling selfish morons who have no plan beyond "seize power" are completely played out and one dimensional
also by that definition you could include all kinds of villains, religious extremists who think they can save the most souls by converting society by force, and forge a utopia based on christian ideals...is that really a "villainous progressive?"
couldn't you say some of these Marvel character types are practically extremists of that sort, even if they don't mention religion?
isn't the idea of a "villainous progressive" an admission that progressivism can go too far, rather than just claiming that if it's not well-considered and results in negative outcomes (like half of all life being slaughtered), then it isn't really progressive to begin with?