What is the real problem? Guns or the people who use them to kill other people, or something else?

The cult of violence through your society, and your films incl.

Bullying is U.S. American nature, e.g. look at your foreign politics.

^this^

This is a point that I would not argue with.

Definitely the system is driving people insane and that system actually includes almost all of us. People treat others like shit and don't realize they will be responsible after someone who've been treated like shit can't take it anymore and go on a shooting spree...

But on another note many of these cases are probably false flags or/and deep mind control and don't involve people snapping just because their life sucks.

Good points. A combination of both would perpetuate more of the former.

That about sums it up, The programming that we receive daily makes us think that this type of behavior is correct, EXPECTED and the NORM. With what is BANGED into our head from TV, Books and Radio constantly what else do you expect will happen. How many of the episodes of TV can be related to this type of action, mimicking real life. Think of the Pavlovian Experiments, you do what is wanted and you get a treat.