Some observers (if we can dignify them with the term) have suggested that if more people had been armed at the Tuscon grocery store, there would have been less carnage, as the armed would have taken out the shooter. Yeah, haul out your piece and start shooting into a crowd of people. I can't see that ending well. Others have suggested that the shooter would have been less likely to be a shooter were everyone carrying a concealed weapon. Uh, this kid was mentally disturbed. I don't think it would have mattered. A lot of guys with guns think they're the Lone Ranger, riding to the aid of damsels in distress and picking off the bad guy with a single shot. That was a TV show. No one was actually shot. The "bang bang" was all sound effects.