Seriously, how hard is it to sit your kid down and tell him that what he's watching/playing isn't real, and all of the life lessons that he already knows (such as "don't stab people") still apply.
Apparently, it's harder than trying to get the entire world to only put out the types of media that you consider acceptable to show your children.
__________________
Dr. Boogie: Everything is so simple when you have a rocket launcher for an arm!