I don't have an answer just observation.
Single parent families that don't allow a balanced upbringing. Putting 12 year old kids with a hard on and raging hormones on Ritalin before they have a chance to figure out who they are and and a father to set an example of the path they need to take at critical crossroads in life. The internet exposing kids to things I still find shocking. The disarray of your future in this economy. Information overload.
It's a cocktail of problems.
I can say this however with 100% certainty from my observation; the people who seem to be going off the grid are not game hunters or trained killers. Those arts take discipline, focus and longevity to learn so don't feed my 'violence culture'. They are some of the most centered people I've met in my life.
Who wants to bet this guy was a boy with no idea how to be a man because of the above factors? I'll bet he was a picked on, frustrated, drugged up (prescribed drugs) emasculated confused little boy who snapped.
I'm taking bets.
“The democracy will cease to exist when you take away from those who are willing to work and give to those who would not” - Thomas Jefferson, 1801.