If he's allowed to play them elsewhere... what's there to give in on? It's like "you can drink elsewhere, but I don't want to see it, so no drinking here" or "have sex at her house, not ours".
I guess I'm just confused. If you allow it elsewhere, why wouldn't you want to be able to monitor it?
In our house, my son's gamer friends (9-13 that he knows IRL.... he has the full spectrum of gamer friends online, including many adults, but that's different since they have no influence over his daily life) parents and I all know which games the kids are allowed to play, and which ones they're not. Sure... they sneak from time to time (an average of 1x per year per kid)... and then they get busted and grounded, or not grounded but just banned from electronics for a time (grounding includes being banned from electronics).
It's a pain, but I'd also rather go through this "Welcome to boundaries" NOW rather than with the aforementioned sex and alcohol stuff. Granted... we may well have to again, but at least there will be solid precedent.
To me, though, it sounds like you have 2 problems:
- Games you disagree with (I don't allow many games in my house. I LOVE Halo -Not only are you 'saving the world', but also end up making an alliance with one of the enemies aka it's not pure black and white. And it's blue glow-in-the-dark blood. I'm not too keen on COD, but there are language and violence filters so you can turn off explicit content and language... there ISN'T any language or explicit content that needs to be shut off in Halo... so I allow COD in moderation).
- Gaming period.
Those are 2 separate issues. My 9yo is not only a gamer... but a game designer in training. He's getting pretty good at it. It's not something I would want to do myself... but it's a passion of his (started when someone told him a job out there is a video game tester... doesn't pay well, no real career path, but designers test games AND get to create them. So I introduced him into the design field a couple years ago.) Even so; we have content limits, and time limits. The whole point being to teach balance. He has to, in order to play games / be working on games, keep his life balanced. We also go over content together, and have frank and lengthy discussions on why some things are allowed, and some things are not. That's OUR compromise. Manda F offered another great compromise. You don't HAVE to compromise, but I would suggest it. That way everyone gets what they want.