Online anonymity permits endless Sybil attacks -- helping turn communities' frustration from anger and rage into violence. I'm guessing/assuming that 8chan is an anything goes censorship free community (like 4chan was/is?). And maybe it's not explicitly in support of racist ideals but instead refuses to condemn any ideologies or discussion. But because of other communities' moderation, they likely become one of the bastions of the racists. So even if their ownership never had any interest in hate speech, their platform becomes a de facto mechanism for its spread.
As much problems as anonymity causes I sure don't think that some new Real World Identity driven Internet would be a good idea. But sites with next to no content moderation seem like a bad idea. Not that I can imagine a resolution, really.
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I imagine how frustrated I might feel if I didn't have some kind of daily work or creative task to keep me busy and fill me with purpose. If I felt depressed I might be willing to blame it on someone. If everything I read said that in fact there is someone to blame, I wonder: would I be able to see through that? Would I stand up and say 'no, that's wrong: those people aren't the source of our problems'? I like to think I would. But I've definitely caught myself (long after the fact) buying into BS groupthink/hivemind conspiracy hogwash.