DD4 and GDog; I do carry every day, not only because I can but because I see it as a civic duty of sorts, because and armed society (with the right attitude) is indeed a more polite society, because I am my brothers' keeper. In no way am I "looking for it" and in no way would I relish the thought of having to shoot anyone for any reason. And so I think it comes down to one's state of mind and general "constitution". In general I believe that if you have the right "constitution", or "aire", about you, then no one will think of making you a target, but that also would require a lot of conversation to explain. Some people will probably never understand it, and instead take it as my acting like a tough guy or some dumb thing when it's not like that at all.
I recently for example had someone offer to punch me in the face (because of an on-going, long term disagreement). I stood there and told him that he could punch me and I wouldn't resist, and then he froze, got all flustered, and walked away cussing to himself. At no time did it even enter my mind that I was carrying a gun. It simply wasn't a matter for a gun. If God is on our side after all, who can oppose us?
That person was an "adversary" (thoughbeit a felonious one who had previously committed an assault against me) and those can be dealt with by a firm, steadfast constitution. Real enemies; those you might have to shoot. One way you might tell the difference is; the adversary will TELL you he's going to mess you up, whereas the enemy will do it. I've twice been tested by adversaries and both times I merely stood my ground, and would have taken the blows willingly, and they both knew it and did nothing (one became a dear friend on the spot). The adversay wants to provoke you. Don't give him his way. The enemy is already in the fight-- Give him more in return than he can handle. Telling the difference is a very subtle matter, hard to put into words.