Dressed in black, school, gun, you get it.

[Adrian II]

Where do these things happen; in society's with high expectations of how someone should behave.

Sigh. Now you're doing it again. Why are you less perceptive on certain other subjects, when you have such a great capacity for observation as shown above? It's not the whole story, but it is part of it. Criminal forms of revenge (be it in the shape of violence, blackmail, extortion or fraud) often reflect the expectations of the environment where they take place. Bankers don't go on shooting sprees like postal workers. Bankers defraud or blackmail their bosses.

As to shootings and mass murderers. We all know (or should, if we are able to read papers) that these incidents occur in many countries with different traditions. Militaristic or not, 'gun culture' or no 'gun culture', rigid Japanese-style education or loose Dutch-style education, it doesn't matter.

As I tried to explain in some detail there may be a common denominator in these cases. But it does not correspond with most peoples' pet peeves, so it is often 'blissfully' ignored. That doesn't surprise me and shall blissfully leave this thread. Hey, it's only teh Internets.