I'd hardly call a shotgun "harmless," especially as most criminals engage their victims at close range

But Bart's right (cue rage for saying Bart's right about something); stories of people successively defending themselves or others rarely makes the national news. Similarly, members of a criminal organization shooting a person in Camden, New Jersey, rarely makes the national news. Both happen fairly often; the individual stories just aren't national-newsworthy, unfortunately.
Consider that back in April, in Aurora, Colorado even, an off-duty who just happened to be in the congregation shot and stopped a murderer at a church.
http://denver.cbslocal.com/2012/04/22/2 ... ra-church/Did it make the national news? Of course not. One could say the story would only support an argument for off-duty police to carry guns. Yet, considering the history of police brutality in the USA, allowing cops, and only cops, to carry guns when they're not carrying their badges seems like a bad idea.