This is totally ridiculous to even consider. How is the content of a game any different from the content of a movie other than you can interact with it? In a movie you are exposed to pre-scripted dialog and actions where the motives are very apparent. The violence is far more graphic and realistic than anything that any game has produced in the past and to present.

Yes, one might argue that a game is open-ended and allows the player to add their own input which can lead to a more violent experience. In my personal opinion this is hardly influential to the user as it is just a virtual environment for them to express themselves or play the way they like, it's nothing more than an outlet for something that is already part of your personality.

Now on the other hand, a movie has developed characters with their own drives, personalities, and motives. This character could be the star and be depicted as someone who is "cool", which can lead to admiration by the viewer. Now you have a situation where the admirer approves of what the star of the movie does; be it killing, fighting, etc because they have accepted it as being "okay" and admirable. So, as a result, you have someone who might be overly-influenced by the movie's character(s) and mimic their behavior.

In response to movies, they placed a rating system. It's simple, and logical. If you do not match the age or guardian requirements, you do not belong. So rather than discipline the entire gaming community or movie community, parents need to be held responsible for what their children are exposed to, not the industry and everyone else.