Personally I've come across many people in China, especially women who are/were
seriously fucked in the head.

Nah mate, that's just because they're women, lol.

Foreigners in China will also notice that other laowai start to go insane after two years or
so. I even felt at times that China was a giant lunatic asylum.

Of course, how do you think that we all ended up posting shit on here? Once you're surrounded by those f**kers (other laowai), you end up being affected in some way or another. I secretly envy those that do midnight runs and get out of there.

I've heard Chinese people say the most idiotic and illogical things. One guy at an English
Corner told me that Chinese bodies are "constructed differently" to other
races.

Japan and Korea does this too. There's some truth in it, look at average IQ counts from that part of the world, they are actually the highest (although one could doubt the Mainland, that rural poverty/incest f**ks everything up). Yet, some of these supposedly intelligent people do end up becoming ill in some way or another and I often wonder if it is that which can make them so damn dangerous.