[El Blanco]

I agree that it is more about violent people making violent music than vice versa. However:

Guys, why do we play Barry White when a girl is coming over? It may not cause sex, but it is certainly going to let her know what we're thinking and hopefully push things in the right direction.

Its the reason I listen to heavy metal and such during my workouts. It gets my mind going in that direction.

While violent movies, music, and video games aren't the cause of these acts( that is always with the purpetrators), they are at the very least warning signs.