Games are just that: games. They're our way of doing things we can't do in real life. I can't drive a fast sports car or fly a fighter jet in real life, but fire up a computer of game system and in minutes I'm taking turns at 120 or shooting AIM-9s at other people.
Parents are the ones responsible for policing video games, not retailers or developers or companies. Though I don't agree with the notion that video games desensitize violence, I think that a parent should have the sense to at least examine what games their kids are playing and tailoring their parenting and tachings around the games and the fact that it's not real and never should be.
In all the cases where kids go wild and shoot people, we blame video games. We blame them because we think they teach our children how to become killers and do it remorselessly. If that was the case, the Army would be buying cases of GTA: Vice City to train soldiers. The "games cause violence" call is utter crap. Most of the time the kids that go wild have mental dysfunctions. It's the parents' responsability to handle situations like that. If a kid cannot distinguish reality from a video game, they shouldn't be playing it. That's what causes problems. It's not the games that are being made that causeing this, it's the lazy bellybutton parents who don't take the time to learn about what their kid is actualy doing.
After a hard day's work, I come home and I crack virtual skulls in GTA3 or Soldier of Fortune 2. Why? Because I can't do it in real life and I find it relaxing. I am mature and intelligent enough to understand the difference between a game and reality, much like everyone else here. We all understand it, so we play the games. I've played games like this for years and not once have I ever gone out and shot someone or stolen a car. It doesn't happen. There should not be a law requiring IDing someone buying a game that is M, beause if a minor is able to buy it without parental knowledge, then the parents garner all responsability for the kid and whatever actions MIGHT arise from it.
As unfortunate as it is, no parent will ever say their kid is messed up. If more parents took the time to educate and care for their kids, there would be no need for laws like this...