Lol, gaming is the least of my parents worries. I was smoking at 16 and not just the legal stuff either. They paid for my trip to Amsterdam on my 18th birthday, knowing full well I'm going to spend the entire week there stoned and drunk off my ass and drinking heavily (I didn't bother with the hookers but even if I did my parents would probably be more concerned with how many jokes they could make about it), sometimes I wish I still got stoned every now and again, but alcohol is so much easier to come by, tastes better and does the exact same thing.
When I turned 21, I went off to travel America for half a year, they knew full-well about how dangerous such a thing could be and that the people I'd be staying with were people I only knew over the internet and yet the only thing they were concerned with was that I give them a call every once in a while, gave them some of my money for their account in case something went wrong and that I was fully insured.
To be honest, I think the only thing they ever get concerned with is that if I'm going to do something that might be a little dangerous that I make sure I've planned it all out in case something goes wrong. They know for a fact that I'm way too lazy to go off killing people just because I saw it in a game once, I've thought it through and every time I wonder how people manage to commit murder all I can think of is just how much bloody effort that must take. Screw that, it's so much easier to do it sitting down and only using my thumbs. Also, violence is something I just never saw the point of as a kid, whenever someone picked on me for some asinine reason like my hair or whatever, I'd think about punching them in the face, but that leads to them punching me in the face, so I'd punch them back and so-on and so-forth. How does that solve anything? The easier thing to do is just laugh and walk off, saving me some time I could then use to do something a lot more entertaining than getting into a pointless fight over nothing.
Hell, when I was a little kid they didn't care when I watched Predator, Terminator, Alien, Hellrasier or whatever other 18 certificate films. Some of the prudish out there might consider this bad parenting, but you'd be wrong, I know the difference between what's right and what's wrong and I know the difference between fantasy and reality. If anything, they trust me a hell of a lot and I'm intelligent enough to reward that trust by not taking the piss and doing something stupid. I'd actually argue that parents who are overbearing and constantly try to shelter their kids from reality are the ones doing the real harm, how the hell are you going to learn anything about life if you don't experience any of it first hand?