It appears your poll didnt work.
But i think it should be a mix between the parents and the children.
My dad used to let me play violent games like resident evil and gta back when i was about 8, and in no way would i say im an agressive person.. i know the difference between whats in the game and whats not. So if i did decide to go steal a car and run over a prostitute, its not because of a game.
At the same time i know there are children who might be more impressionable than me, my dad didnt let my brother watch or play violent stuff til he was about 14, because he'd get scared and have nightmares and stuff.
So i think it should be a case by case basis, with no right or wrong answer.
If you think your child is mature enough then sure, if not then no.