I remember people saying that the article about Carl Jung was not worth contributing anymore because of his fascist sympathies with nazism. I don't know what to make of that.

I've experienced something similar about users downplaying on talk pages the atrocities done by the Soviet Government, like the Holodomor famine or the Katyn Massacre, in contrast to the atrocities done by the Nazis.

Controversial and relatively unknown subjects are easier to be attacked and ignored on wikipedia.

https://en.wikipedia.org/wiki/Holodomor

https://en.wikipedia.org/wiki/Katyn_massacre

Editors have biases. The best we can do is shine a spotlight on them.

People are opposed to this, of course. No one likes to be reminded of how they're limited - and people get really nasty when you accuse them of being a dishonest interlocutor.