There is absolutely no arguement against the developers. They aren't making Teletubbies games with shotguns and nudity, now are they? No, they're making games that specifically say they're for 17 years olds, with shotguns and nudity. If the parents let them play it, it is the parents' fault. The game developers aren't giving copies of GTA to children. And them knowing kids will play it is not an excuse either. You're basically saying, just because there are kids in the world somewhere, no one can swear or take off their clothes, EVER, because some kid might see it.
The whole "Doom causes kids to kill" thing is also BS. Think of it this way. What if a kid was really angry? He felt like killing something. He even thought about it. So he did... On a game. See? He got to vent his frustration, but he didn't hurt anyone except some pixels. Games are great substitutes for doing the real thing.
Sorry to sound rude, but I'm just fed up with these morons who are against video games. To quote the Daily Show, "Are we protecting our children by censorship, or are we just raising a nation of sissies?"