if one "good guy with a gun" is on the scene of a shooting he might do a real service. That is not what the NRA and the gun nut crowd want! They want everybody at any event that wants to carry a weapon to have the right to be carrying a loaded weapon pretty much anywhere. If a shooting starts that is not going to make the event safer...it is going to make it an even more horrific tragedy!!
Ever wonder why loaded weapons are not allowed at NRA convention events? Just asking.
BTW: when u start to talk about believing being shot by a good guy with a gun is less a tragedy than being shot by a bad guy you really start to sound silly! Why not try to make it less likely that you will be shot at all? Like it or not, it has worked in Australia for the last 23 years!