So I see downvotes. I think it's a pretty dangerous delusion to think that the side one politically sides with:

a) would not have authoritarians

b) hence could not implement authoritarian power structure if it became prominent

History has shown that authoritarianism can rise in what ever political ideology.

Pretending that ones political collaborators did not include at least some potential authoritarians (even if not vocal) is politically quite naive, despite what the common accepted mainstream position in ones party is.

Fair point, stalinists are authoritarian.

They're also a relatively tiny group of ridiculous LARPers that no one takes seriously.

Except for that time in Russia when they murdered millions of people because those people were trying to normalize fascist speech.