I was there, I saw the thread. @TheDude, did you? It was pretty strongly in favour. Do we really need to keep waiting around to see if an instance administrated by a guy who wants to declare “cis” a slur is going to turn out okay?
https://sh.itjust.works/post/216888 for context.
Well, let us assume that there is an instance X that specifically ban any instance that contains historical stuff about Holocaust and how bad it was. The instance X may not contain any Nazi propaganda, but you know that they are Nazi. Would you ban them or not?
If you really need to imagine such elaborate examples and have nothing to actual link to I think this issue can be put to rest safely.