There were two very hard lessons that the twentieth-century brutally taught us: (1) fascism is bad (2) communism is bad. We’ve learn the first lesson, which is why self-proclaimed fascists get in trouble. Yet millions of deaths were not enough to teach us the second lesson. Self-proclaimed communists can still find acceptance within the mainstream. Jordan Peterson discusses this in the video below, suggesting that we have only learned one half of the lesson the twentieth-century could have taught us.