I really see where they come from, and why they prefer a strong moderation on this kind of topics. I guess it starts to get blurry once you have to define what is misinformation. Historical accuracy is hard to achieve (this is why I still go to /r/AskHistorians, and I linked a few threads in the other comments).
I saw some time ago a graph showing how the perception of the USSR changed a lot in Europe during the Cold War compared to just after WW2.
The following statements might be all true at the same time
USSR committed imperialist massacres
USA committed imperialist massacres
most of the Western European nations committed imperialist massacres
Sometimes I'm wondering if those three statements can be compiled in a single comment and not instantly start a comment war with everyone trying to push their own agenda, and mods having to interfere following their own views.