And yet the Codex' population of commies is still here, and lots of less polarized types to boot.
Meanwhile, as brought up before, NeoGaf for example got completely taken over by SJW nutjobs... Who used heavy handed moderation for the purpose. Most forums of note that I can think of that had some kind of connection to culture war topics ended up polarized, most often towards the "left". Comment sections on fucktons of websites are either closed entirely or disallow the opinions of one side.
Youtube comments section may be shit mostly, but all the insults etc don't seem to stop massive amounts of people from commenting there anyway.
The vast majority of people in the world seek positive reinforcement, and so in the end, a complete absence of moderation simply ensures an echo chamber for whoever is the loudest and most committed to pushing their agenda.
And
yet moderation very often results in exactly the one-sidedness you think is going to happen here. Or rather, the opposite kind of one-sidedness.
This is easily one of the least one-sided places on the net. That bothers some but draws others, and not just the nazis you're so worried about.