Episode 234 of the Letters Page: Creative Process: Bunker Foes

[fjur]

@FrivYeti

Yeah, there’s a phrase for that sort of villain, but I can’t remember what it is. It’s the villain where their cause is too reasonable so the writers have to have them do some out-of-context atrocities or else the readers will all be on their side.

This perhaps?

Well-Intentioned Extremist - TV Tropes