Violence in a video game won't change anything. If you come from a broken home with violent parent(s)/or guardian(s), then you might kill. If you're a good person violent video games won't make you commit murder (another reason, maybe, but not video games). The problem here is not violence. It's the other thing about M rated games (R-rated movies, etc.) that parents should keep their kids from playing/watching. And it IS the parents call, it's their responsibility.
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