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Why people angry enough to kill and end their own lives in America?There people who are angry enough in other countries:
* https://en.wikipedia.org/wiki/2018_Toronto_shooting
* https://en.wikipedia.org/wiki/Toronto_van_attack
The thing is that with easy access to powerful weapons, it is easier to implement such impulses in the US compared to other industrialized countries.
The US is not some hell hole where people have nothing to lose: for the most part it is a nice place to live (though, as with any place, it has better and worse areas). I think a lot of these incidents could be curtailed with better social conditions.
However, having a lot of weapons easily available is like having a lot of dry brush in the country: all it takes is one person's spark for things to catch on fire. Furthering the analogy, it's not that other countries don't have people who can be lit off, it's just the surrounding environment has reduced (though not eliminated) the chances of a large conflagration.