It seems like investigative reporting stops "investigating" once they get to the point where they see that guns were involved. So of course THAT is the cause....
On another line of thinking, heck, I like first person shooter games as much as the next guy, and I enjoy watching blood and guts action movies as well. This sort of entertainment just was not available when I was growing up, and I can't help but wonder how damaging this sort of thing may be to impressionable young minds that don't have any better role models to latch onto. Let's face it, the hero or heroine in these games and movies will just wade into rooms full of bad guys with guns ablazing with a display of ultimate control over their environment and destiny from the smoking end of a gun.
Maybe it's just a stretch, but are these young malleable minds just getting warped way too much to where these impressions become fantasies, and then the fantasies turned into an attempted reality when some emotional slight makes something just snap? Some kid then wants to escape reality, and the reality they wish to act out winds up getting people killed.
SOMETHING is definitely wrong these days. And it appears that no one is really interested at getting to the root cause, merely stopping when they get to a glaring symptom that fits the PC agenda of the day that pleases their editors.