But what has bred the victimization that these "disturbed" individuals feel? Most of these "mass-shooters" have proclaimed that they have been made victims by their peers, by society, or by some other aspect of their lives in general. They are acting out of a desire to exact revenge or payback for this perceived mistreatment.
In other words, they feel entitled to the happiness and satisfaction that others have enjoyed. When they don't get it, they feel "wronged" by others, by their parents, by their government, or by society. How many times have we heard, after some heinous act committed by someone usually born after about 1976, that "we, as a society, somehow let him down"?
This ideology that "everyone gets a life-participant trophy" is relatively new, pushed by the liberal movement, and perpetuates the idea that one's failures are the fault of society, and one's successes go to the credit of society (remember the infamous line directed at successful small-business owners of "you didn't build that!")? They take away credit and they take away responsibility.
The liberal agenda had filled young, poorly-guided souls with anger, resentment, entitlement, and rage, yet has done nothing to guide them in their handling of these emotions.
Therein, in my opinion, lies the vast majority of the problem. Mental health? Not so much, unless you consider all these self-perceived victims to be mentally ill (and, as fast as we are, as a liberal society, drawing up new labels to do exactly that, maybe we could call it that...)