Toxic materials can make you real wacky, but that has nothing to do with anything psychopathic.

Unless somebody puts some effort into combining the two, which does happen.

Psychopaths would have done damage whether they were affected by chemicals or not.

Now you do bring up a major conundrum which many people may not want to face at all, and would not know what to think no matter if it was true or false.

You make a legitimate observation whether that is coming from outside the USA or from freedom-loving Americans.