Media Violence is no different than flowers growing in a tranquil field. It all boils down to taking responsibility for your actions. Media violence doesn't make society more violent, it only makes the media violent. If folks can't take responsibility for their actions instead of blaming all their problems on "the devil made me do it" and other related horseshit, then they need a real reality check. Violent movies, violent TV, and violent video games don't influence anyone any more than they let themselves be influenced -AND if they actually COULD influence someone, it's the person's responsibility for their own actions that they do with that influence ANYWAY.
In all reality, it doesn't really matter as long as you have parents that raise you right and you maintain your grip on reality as you grow older.