[JTHomes]

CCW on campus may indeed have prevented this type of tragedy. For the same reason no one walks into a police station and kills 30 cops - they know the cops are armed and the attack would not be very successful. However, with current regulations in place at most university campuses, any armed psycho knows he will be unopposed until the police arrive. Thus a barricade strategy has a high probability of success for any potential mass murderer.