Everyone is talking about how teen violence is caused by playing video games. Here is my take on the issue - I believe that many things can drive a person to kill. However, it is impossible to remove all negative stimuli from a person's life. Although we still don't know everything about the criminal mind, it seems that some of us can handle life's stresses, and some of us can't. Movies, TV, newspapers, video games, books, and many other places.
Some people even encounter brutal violence in real life.
I really doubt that playing a stress-relieving game like DOOM will cause you to find life expendable. No matter how many groups of textured polygons you send to kingdom come, moving to the real world is still a BIG step. I think the numbers speak for themselves. Some might argue that video games desensitize you to violence. The same could be said for movies, however, and they've been around a LOT longer than bloody video games.