Not missing the point at all, and not saying it will make everyone go crazy.. I am saying IT IS a fact that it conditions people.. Sorry, but it is.. I dont see why you all even debating it.
Let me make sure I'm understanding you correctly: your argument is that he was "conditioned"? What does that mean exactly? It's a fact that horrorcore "conditions" people for violence? Does that mean they're more prone to violence? Desensitized to violence? What does that mean for McCrosky? Because he listened to horrorcore, he was conditioned for violence? If not for horrorcore, he would have never killed anyone?
My argument is that while horrorcore may be a part of the "bundle of sticks" that lead McCrosky to commit these murders, it's not a compelling piece. His upbringing, adolescence and social life are more telling than what was in his CD player. (in fact, horrorcore probably is a symptom other those things).
As I alluded to before, I work in the legal field. I specialize in criminal law. While I'm a young attorney, I've still sat in on or been involved with many violent offenders. Violent music, movies and video games are usually considered a symptom of his personality rather than a cause of his behavior.
Violent behavior isn't that easy. There are many things that contribute to violent behavior. Think of it as the bundle of sticks I spoke of earlier.
If violent media were the majority contributing factor to violent behavior, the government would have a significant interest in regulating it beyond toothless "ratings" and "parental advisory stickers".
Btw, Kano, the irony is not lost on me that your handle is the name of one of the principle characters in the seminal violent video game, Mortal Kombat. I had a copy of that game for my Super Nintendo back in third grade. And look, I'm a Yuppie.