Is it video games this month? It used to be gangster rap or devil rock or drugs and for a while it was poverty and "injustice".
I would agree that none of these things, alone, would begin to cause an otherwise balanced, well raised person to snap on a fellow human being.
But if the foundation of a persons psyche IS bloody video games, gangster rap, devil rock, and drugs, combined with other risk factors, then we may have a problem individual on our hands. The challenge here would be how to identify and intervene before it's too late.