The reason is very simple.

1. We have the right to pack.
2. An armed society is a polite society.
3. The ability and willingness to fight is usually related to blood alcohol levels and personality disorders.
4. Fist fights are more likely to get you killed than backing out of a situation with your hand on a holstered gun.

Call me a wuss but I will live alot longer as an armed wuss. And I usually don't even pack. Doc