I'm worried about this century.
I don't lose a lot of sleep over Caligula. You got one point for Papa Doc. There are others, but you really have to work at it, don't you?
Where Marxism/communism differ from a lot of other totalitarian ideologies is that despite the murder toll of as many as 100 million to its credit, it still has advocates in polite society, and a place of honor in our culture and education system. A communist can teach our kids his ideas in our universities, whereas a Nazi would (properly) be tarred and feathered.