Its about knowing what's good for your kids as a parent.
Lets be clear, i have no kids, but i do know this, my best friend cousins.
Both are the same age, 8 to 9 years old.
One is a complete terror when it comes to video games, and I had the privilege to watch these kids for 2 weeks, so i know, when he played a somewhat violent game, zelda, he would runaround the house throwing stuff and being bad. He gets restricted all the time from playing, and his mom has to watch what he plays.
His brother? Calm as hell. He even uses a website to make his own super mario levels, real smart., and as a bonus, for his age he gets more play time, and can play games his brother cannot.
So can violent games make kids more violent? Yes and no.
From there i could go into how some people grow up, and lets be frank, want to go and kill people, and unfortunately, some do.
Blame the games? You can, and the parents while your at it. Or, i don't know, how about the obvious mental instability that might of had something to do with it.
I play shooters all the time, yet, i know i cant go out and kill people. Because that's bad. Does it make the game bad? Nope.
So you see, i made several points here, and the thing is, some people will agree with them, or disagree with them.
But that's how i feel.
Hope i answered your question today.