I understand that and think it's cool that McDonalds is now posting nutrition information (or lack thereof, get it? comedy!) but the product hasn't changed.
And that's ok.
No reasonable human being can possibly say "McDonalds made me fat" because that's not the case. They made themselves fat. I don't think MS should have to say "Don't play 20 hours a day because that might be dangerous" but even then people would still do it.
In fact, your logic dictates MS promotes laziness by having a gaming tournament to begin with by even producing a video game. Are they at fault for general obesity by having a video game department? Of course not. Your logic didn't even dictate that but it wasn't a stretch to extrapolate.
After thinking about this and you seeing my stream of consciousness I can see your points, absolutely, but I think the majority of blame goes on these kids.
Actually the government made them fat because they refuse to acknowledge that calories in/calories out and the Food Guide Pyramid as a method for weight loss is based on a pile of lies in Ancel Keys' 7 Country Study, and that insulin and hormone regulation is the most effective weight loss strategy based on our evolutionary ancestry and biology...
So... Thanks, Obama.