The main problem I see is if there is a demonstrable correlation between real-life violence and video game violence, it'd be very difficult to tell which proceeded the other. I would think, for instance, that those predisposed to violence would be more likely to enjoy the violent aspects of video games.

The media's claims that the secluded white guy who shot up a school did it because they played violent games is ridiculous (for instance, I'd say a good 95% of secluded white guys played counter strike when I was at school - perhaps they also enjoy eating food and listening to music), but I don't think that we, as gamers, should be so averse to studies being done as to the potential effects of video game violence.

There is a habit (obviously not unique to gamers) of dismissing any studies they disagree with as being 'inconclusive' or having 'stupid methods', while shouting the results of studies that we agree with from the rooftops.