It seems like it might be time to consider that mental illness is a Group affair, like a Mass Panic. Perhaps PTSD on a group scale.
It has long been known that even young , healthy men can develop serious mental symtoms as a result of even two weeks of combat in a serious war. But recently it develops that the effects spread far beyone those who show symptoms, both in a time dimension, and also in a combat intensity sense. I.e, 80% of 1918 British soldiers in one study were never in a significant combat, but they had plenty of symptons. And they lasted for years. What if it should turn out that social groups under stress for long periods " go crazy" from top to bottom, according to their aptitudes? That might explain a lot of strange incidents , such as school massacres, unnecessary foreign wars, increasing suicides among the young, the US adopting Torture as a policy, Billion dolllar bonuses for Wall St. tycoons who wrecked the World economy, tolerating the Federal Reserve Cartel, and countless other examples of "craziness". We tend to put it down to single defective individuals; maybe there is more to it than that, as any Buddhist could see. The examples I give are because these are NEW developments. When I was young, people did not seem to be so fearful, even though it was the "Depression".