BR 9/19/13 Do violent video games play a role in shootings?

http://www.cnn.com/2013/09/18/opinion/bushman-video-games/?hpt=hp_t2

I've seen expirements where people played violent video games and actually relieved stress, and were calmer
than they were before. If you have the maturity to play a game and know that it's a game, then they are fine.
People who do shootings have a variety of things that add up to it, if you put the ratio of video game players
to shooters, you'd see that most people who play games aren't violent.