Those who pack heat forget several things:

1. They can't shoot first without being the assailant. You have to be in imminent danger. That means that you can only shoot me if I draw on you first (yes, this is quite simplified).

2. It doesn't matter if you're packing an atomic cannon -- you're dead meat if the other guy shoots you first.

3. Why advertise it? It doesn't intimidate me and it just makes you look that much more like a eunuch. Were I to carry concealed (and I have on certain occasions) I carry concealed -- not to play Rambo with real guns.

4. It calls the attention of the cops to you. This is usually not desirable.