I actually agree with you to some extent. If normie sites just allowed open discussion, there wouldn't be as much 'alt right spam'. Quarantining people based on politics has just centralized people with those viewpoints to 4chan, which is inherently a shitposting site, which makes alt right personalities, for the most part, act obnoxious. I know a few that are part of Discord servers that go around and look for communities to indoctrinate. They'll storm the community and shitpost, which usually makes all the decent people leave and the community dies. Most of them aren't looking to debate in the first place.