there's no correlation. the FBI stats show that pretty clearly. no statistically significant correlation between medication, video games, or movies.
clear factors are school bullying or violence in the home.
also, the 12-16 age range is particularly vulnerable -- it shows in the statistics. secondary school can be the most stressful time in a person's life. social pressure is intense, combine this with raging hormones and teen angst, everyone expecting you to perform in public on a moment's notice, zero tolerance policies, everyone seems to be yelling at you all the time, etc.
Still clueless.
I don't think it is so much the games as my sons play the games and they have firearms safety/shooting training, and respect firearms and what they can do. i think it is the psycho drugs the uninvolved 'parents' put their kids on.