No, I'm not delusional or schizophrenic, but I'll agree asking serious advice on this topic on Hacker News is a stupid idea. Anyways, I'm serious about the OP and have even been bothered by Secret agencies before IRL.
It's an Imageboard, there are many of them.
8chan gained a lot of traffic because of the Gamergate [1] controversy in late 2014
The site has nothing to-do with 4chan in terms of administration.
I can't say anything about how 8chan is involved in the El Paso shooting, since it's been some time I've been active on 8chan, but the Christchurch mosque shootings was announced on 8chan.
There are many more of such incidents where Imageboards have played a role - e.g. the killing of a kid by Marcel H. in Herne, Germany was posted and documented on 4chan.
> There is a positive correlation between IQ and mental health issues at least at the higher end of the scale
I have only read scientific studys which confirm that the lower end of the IQ scale correlates with psychiatric disorders. Can you point me to any papers which support your claim? I'm not saying you're wrong, the claim sounds plausible, it's just that I really haven't read much academic that confirm these claims.