[_ivvf]

I have to say, I find your "survivorship bias" argument novel, but also a bit ridiculous, considering that Karl Marx openly called for violent, bloody revolution:

“there is only one way in which the murderous death agonies of the old society and the bloody birth throes of the new society can be shortened, simplified and concentrated, and that way is revolutionary terror."

So the ideology claims violent overthrow of government is needed, but it's not the ideology's fault when the overthrow leads to a murderous totalitarian regime arguably far worse than the government it replaced? I don't know how you can seriously hold this world view.

[NoGravitas]

Violent bloody revolution is fine! It's what comes afterward that leftists disagree about. Compare, for example, Revolutionary Catalonia (unsuccessful) with Soviet Russia (lasted 70 years, never achieved communism).