I don't think violent video games plays as big a part as people like to think. There is a video I could link to of a guy who has a similar view as I do on violent video games and what effects it has on the psyche, but the video in question contains actual footage of a real death (of a politician killing himself on screen to avoid dishonor or something). I don't know if I should link that here or refrain from it and perhaps starting a topic in After Midnight and posting it there.
But the gist of what he says in the video is that gamers do not want real violence and that violence in both movies and video games is cartoony even in the realistic stuff. It's exaggerated and made not to look like the actual thing, because death is too serious to be entertaining and that the brain is able to discern real death from fake ones. Jimquisition (the guy who made the video) said that when he posted the real death in a real old video without warning anyone, a lot of people, gamers actually, were really upset with him and said how disturbing and creepy the video was.
When posting it again in this new video, he did put a warning, but he had to fight and really convince a lot of people, all gamers, to let him show it. Some of these gamers play violent video games and yet they were hesitant to let him post up that footage again. Jim doesn't have trouble posting up clips of movie or video game violence, but runs into hot water when posting up the real deal because, again, we can tell the difference between an actual death and cartoonized death.
So honestly I don't think violent video games turns anyone into killers really. People just like to point blame at something. But even if violent video games were banned totally, there would still be violence. People could be "inspired" by something else, and that something else will get the blame. It's an endless cycle.
If I am able to post the video here, I'll edit my post later and put the link in. Jim has kindly included a time stamp frame so if you want to skip the actual suicide scene, you can.