Azure9 said:
A world war 2 game where you play a nazi
This wouldn't be bad if it were just like a 'Call of Duty' style of story, where the plot is advanced by the gameplay, and as such it doesn't really matter what holds the gunfights together, as long as it plays well.
However, this would have to tip-toe around some nasty topics, such as being forced to execute jews, say, as some normal German soldiers were ordered to do during the war, or things in that area.
I think the reason games can't handle more mature content is because Games are designed to be escapist experiences, which are exciting, or fulfilling in some way. I don't think a game where you were forced to execute jews as a Nazi would be a particularly fun escapism, do you?
That said, I do think Games as a medium can probably handle more adult themes than they seem to be allowed in the current climate. I think this is because developers in general at the moment seem to prefer a guaranteed sale to any kind of thought-provoking deepness to a game.