Wow, I haven't been following this thread at all, but seriously guys... Blaming music for kids' behavior is as outlandish as blaming video games for kids' behavior.
The environment in which the child or adolescent grows up in is the only factor that influences his behavior (i.e. parenting, socioeconomic atmosphere/location, etc. etc.). The fact that these kids, who are already likely to act out negatively based on these feelings and emotions they have, listen to rap, metal, and screamo and play GTA doesn't mean we can blame their actions on the music and games. I spent my entire adolescence listening to heavy metal and playing Mature-rated games and I turned out fine, because I had good parents, and good friends. My closest friend listens to nothing but Eminem singing about raping and killing people, and he's a goddamn EMT on the President's List at his college.
Post hoc ergo propter hoc: "after this, therefore because of this". You can't blame one event as the cause for another event, simply because they follow one after another; it's a logical fallacy.