There is good reason it isn't sold to kids.
Having said that, none of this stuff has ever caused someone to "go over the edge" so to speak. Not if they weren't already likely to do so in the first place. So it depends on mental well being, as well as parental guidance. If the kid goes and kills because of VGs or music, the kid already has problems which should be (or have been if in past tense) taken care of.
Electra: "Let's go...together"
Vincent: "When I was with you, it was the only time I felt real"