Mostly, they don't want to face the consequences of players' bad behavior. In an interview with the website Rock Paper Shotgun, Battlefield 3's executive producer Patrick Bach explained that he doesn't "want to see videos on the Internet where people shoot civilians. That's something I will sanitize by removing that feature from the game." Bach believes that video games are serious business but that players' irreverence is holding back the form. "If you put the player in front of a choice where they can do good things or bad things, they will do bad things, go [to the] dark side because people think it's cool to be naughty, they won't be caught," he said.
Via The Corner at The National Review Online:
Refighting the Pacific War? [Mark Krikorian]
"It's a dog-eat-dog world out there, and I'm wearing Milkbone underware." -- Norm, from _Cheers_