8chan is actually not a person, and no evidence has been presented that a user of the site has done any such thing. I have noticed a couple of posters in this thread posting a gish-gallop of links (mostly from discredited sources) purporting to prove something, but one sees upon inspection that they in fact do nothing of the sort.
Promoting a worldview is a tricky thing. To be really good at it, you have to believe, and the more unorthodox your worldview, the harder you have to work to maintain that worldview in the face of widespread resistance. The easy thing is to refuse to even consider anything to the contrary, to only talk with people who share your views.
This pattern happens over and over in tech, too; it's not like we're exempt. Look at the dot-com bubble, for example. It was an article of faith that the Internet would change everything. That it turned out to be true eventually didn't matter; enough people took leave of their senses that we wasted billions.