Let me start by saying that this article won’t change anyone’s mind. The kind of people who obsess over this kind of thing are not the kind to take kindly to having their kind of world view challenged by these kinds of facts.
C.J. Ferguson, at Stetson University, in Florida, did a simple study* of the correlation between real world youth violence vs video game violence, using historical statistics. Earlier studies were lab-based, forcing subjects to both play violent video games and take psychological tests, and many came to the conclusion that the more they did this, the more violent their experimental subjects became.
Here’s the key graphic.
The correlation is negative (R = -0.85). Based on this, one could claim that video game violence actually reduces youth violence. After all, if you’re at home playing games, you’re not out on the street, getting wenches with child, wronging the ancientry, stealing, fighting.
Of course, since correlation does not necessarily imply causation (although, as Randall Munroe says, it does waggle its eyebrows suggestively and gesture furtively while mouthing ‘look over there’) we can’t necessarily claim that video games reduce youth violence. What we can say is that the doomcriers theory fell at the first fence, that violent video games, in general, demonstrably do not, in general, increase youth violence.
*In case the link rots, here’s the full citation: Ferguson, C. J. (2014), Does Media Violence Predict Societal Violence? It Depends on What You Look at and When. Journal of Communication. doi: 10.1111/jcom.12129