The issue is that this is a cult that we're dealing with. The reason they are banning, or stopping, people from making any sort of statements outside of their narrow, typically racist and otherwise bigoted, view, is because those views do not stand up to any sort of scrutiny whatsoever.
They need to control the narrative to protect these ideas based on falsehoods, and the best way to do that is simply silence the opposition.
They do this primarily to protect their own ego's with the typical line of thinking being something along the lines of;
'Huh, this view is getting a lot of negative attention, is it possible there is something flawed about this belief I hold? No, it can't be wrong, because I believe it to be right despite any sort of contradictions and despite having no evidence other than my own opinion, no those people are just [heretics](bigot, phobe, etc.) to my [cult].
This serves a secondary purpose as well however, in recruitment to their cult, as preventing people from seeing either both sides of 'an argument', or any sort of negative feedback on 'an argument' influences people, particularly younger people, to believe that it must be the correct opinion. It gives the illusion of popularity and mass support, and typically people are geared to going with the crowd. IT's exactly why these types HATE freedom of speech now that they're in control of the 'popular' side of social discourse, because it halts any further advance to their edge once they're in control.
This is very insidious, and honestly if I had the skills I'd make a new website myself. If you care about the art work, or the community, or the fandom, and you have the skillsets, you probably should make a new image hosting site and gear it towards freedom of speech and expression. You won't be able to fight this evil otherwise.