violent television

Does violent television promote violence in kids? And does it do the same in games? Shouldn't kids be smart enough to no that in cartoons every one survives, and that if you pushed your friend off the empire state building he wouldn't? Or in video games that if you get shot there is no saving and loading the game its just plain THE END. So is it ok for kids to watch or play violent things with out supervision? if they know the difference between it sure but if they don't then...