1) No
2) 3-4 hours isn't a lot
3) most learned from their parents
4) WHO CARES? It's virtual! It's not* hurting ANYBODY.
English
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Think about what you could do in 3-4 hours. That's only the average as well, most play it longer. You cannot prove that they learned it from their parents. Being virtual doesn't change anything. Your mind still gets used to the act of murder and violence.