I think that one seriously has to question what mental illness is at this point. When an entire nation is suffering from mental illness, is it actually an illness? Or is it a human response to a terrible situation?

In the US, 25% have some sort of chronic mental illness, and another 25% suffer from periodic or episodic mental illness. At least that was the figure some years ago. I haven't checked for a while.

What all these men have in common is an expectation of something that didn't happen and they have become violently angry.

They were expecting sex, and it didn't happen. They were expecting friendships, and they didn't happen. They were expecting to have loads of girlfriends, and it didn't happen. They were expecting this and that, and it didn't happen.

At the root of this kind of anger lies promises that were fulfilled. America promises its people all sorts of things - if only they will dream, work hard, be polite, believe in god, etc. then they will get this or that. It's a load of poppycock of course, but kids socialized to believe all that will sooner or later snap when those things don't happen.