My prior comments weren't specifically about shootings such as at the NZ mosques. I was thinking of violence in general and particularly why American boys are shooting their peers at school for example.

With regard to mass shootings such as the recent massacre in NZ, it is the result of tribalism in it's most extreme form. It all starts with an idea. Just one idea. "We are right and therefore good...they are wrong and therefore bad...so they must be punished." That one idea has been used to rationalize heinous acts all over the world for as long as there have been humans. Tribalism is not specific to one race, religion, class, or sex.

Question: what is the antidote to tribalism?

Perhaps folks will enjoy this article:

Biker gangs stand guard outside NZ mosques during first Friday prayer since massacre | London Evening Standard