I agree that underage kids should not be buying Violent materal (games , movies, etc.), but I have been a strong believer in Parents should control what their kids play. I understand why Jack did what he did, but the guy as gone fucking mad.
Most stores I go to (I live in IL) do card younger kids, or will tell them they are not old enough. Actually one time a parent walked into a gamestop with her son. Her son looked about the age of 10-12. He wanted Leisure Suit Larry, Magna Cum Laude and the gamestop employee said "oh that game is not for kids. It's very perverse". The mother didn't have a clue about games but thanked the gemtleman for helping her out. So it just goes to show you that not every employee ignores policies.