Utopian idealism is dangerous and historically responsible for the worst atrocities because its proponents believe they are justified in committing violence for the greater good.

“the biggest killers were utopian idealists. They were people who believed in a better world. Hitler undoubtedly, you know, it sounds weird to say it, but he's an idealist. Stalin is obviously an idealist. Mau is an idealist. They think they are going to make a better world.”