Um, pacman, your arguments are unrelated. The fact is that if a kid plays a game in which he is constantly killing people the chances of him actually killing somebody in a similar fashion are increased. MOST people will not be effected to the point of actual violence but the fact still remains that a majority of those who do resort to violent crimes DO have a history of playing violent games, watching violent movies, etc.
I'm not saying that I don't find a good first person shooter to be a good time, but I am saying that some people are effected by these more than others. They should not be banned at all, but instead the parents should be more aware of what their kids are playing.
For example, if your highschool kid plays Quake all the time, should you be worried necessarily? Not immediately. Heck, it's just a videogame. But, how about it your kid starts wearing black trenchcoats around and joins a group called the "Trenchcoat Mafia" who makes light of the use of guns, poses with guns in pictures, among other things.
That's what the two kids responsible for the Columbine massacre did. Sure, Quake did NOT cause them to kill people. It was just one of the ingredients. I'm saying that it's the parents responsibility to notice signs like this and take appropriate action.
However, the fact is that parents most of the time will not care. The unfortunate truth is that there is a chance that violent videogames actually could be banned if this crap continues. Even as we speak several big cities in the US have already outlawed smoking in public places. Smoking was once allowed almost everywhere in the US and nobody really tried to stop it. It's a whole different animal, but even so, if smoking can be stopped, maybe the media can eventually be limited. Freedom of speech is already being restricted in some ways. Freedom of "entertainment" could be next.