Every new story about gun violence brings on a surge of letters contending that if more people carried guns, those situations could be reduced in severity or even avoided. Those arguments always cause this scenario to pop into my head:
A shooter opens fire. Chaos and panic ensue. A bunch of armed citizens, hearing the shots, draw their weapons and rush to the scene. They find panic, chaos and guys pointing guns at one another.
Is one of the guys with a gun the shooter, his accomplice or a would-be do-gooder? Even if you know who the original shooter is and you shoot at him, what do the others do? They can't know your role or intentions.