No, I'm not saying you have to be a violent person to enjoy violent video games. I may have stated this in an earlier blog, but I think the there's more to the link between violent people and violent video games than is being explored. People noticed that many school shooters happened to own shooting video games. While it's possible that these video games inspired them to go on shooting rampages, I believe it was more likely their violent tendancies that caused the shootings and happened to attract them to these games in the first place.
My advice to parents (and I'm not saying it's all your fault): If your kids are into these types of games, talk to them, make sure they're not having issues outside of the virtual world, and that their interest in such games does not stem from social issues that could lead to something worse. Violent video games can actually be a good warning system. Take away the games and you're probably just taking away the alert as a side-effect.