That's an interesting observation. I wonder what the proportion of Jewaish psycho killers is, relative to the population as a whole. Some of the most infamous serial killers in New York's recent history were Jewish . . . I'd include David Berkowitz (the Son of Sam killer) and Joel Rifkin (killed more than 20 prostitutes on Long Island back in the early 1990s) among these.
Because of their studious cultural bent, Jews tend to be better off financially. (No they didn’t steal the world, they just worked smarter.) Mental health problems would be more likely to be addressed when it is less likely to be in a money pinch, like do I eat or do I see the doctor?
David Berkowitz was adopted so I don’t know if that counts.