Violent Games As Great Teachers
Gamepolitics and the site Physorg have an in-depth look at a study (pdf) done on the educational nature of violent games. While the implications of the study reinforce the old 'games lead to violent kids' saw, the authors of the research stress that they're more interested in talking up the benefits of games in education. "When considered in the light of what is known to be the "best practices" of education, violent video games appear to be exemplary teachers of aggression ... It should therefore be no surprise that video games are excellent teachers, both of educational content and of violent content... The fact that learning occurs regardless of whether the effects are intentional or unintentional is irrelevant, and should make us more thoughtful about designing games and choosing games for children and adolescents to play."
Either way it's all about Correlation != Causation.
My argument against games making people more violent would be more historical. Lot's of things have, historically, been said to make people more violent, and this tends not to bear out in the real world. Marijuana was once thought to induce psychosis and violent behavior, and while we may or may not agree on whether or not marijuana ought to be legal, most people do acknowledge that it doesn't exactly make you violent. The same arguments were applied to movies, rock music, sports events, and comic books...Anything that might make the kids into ravening monsters. It just tends not to happen.
On top of that, there has been no increase in violence since the advent of truly violent gaming. It's pretty widespread now, so you'd think that any actual upswing in violence would stand out against the preceding decades, but there isn't anything like that in the data.
ad logicam Claiming a proposition is false because it was presented as the conclusion of a fallacious argument.
There have been media studies that have shown that watching violence on television increases aggressiveness in the short and long term. This is not directly a study about video games, but it is counterintuitive to think that video games where you actually participate in onscreen violence would have a lesser effect than television.
At the very least it is a fact that kids will imitate violent behavior they see. This is the reason that you don't see cartoons anymore with Daffy Duck being shot in the face, Porky getting his head snapped in a suitcase, or Sylvester getting hit in the head with a frying pan by Tweetie Bird: Because kids did these things to their siblings after seeing it on television. Obviously a kid isn't going to have a laser gun or a katana or something like in a video game, but instead he's just going to whip a cup or rock at his brother and yell ZAP.
the game doesn't even have to be culturally unacceptable violence. Studies have shown that even things like watching a football game on television has the same effect. I'm not saying it's turning them into little killbots, but there is evidence that onscreen violence does increase aggressiveness.