A little tangential since this is more about gating white supremacist content than violence or sex, but I was on 4chan when it was being infiltrated by genuine white supremacist organizations and Russians that talked about how manly Assad was to influence teenagers interested in anime. I had people in real life to talk to about these things so I narrowly escaped the influence. Looking at the current state of the US, not everyone did. That being said, despite my hope that older people would be less prone to such influence, it doesn't always seem to be the case.