I agree with most of your points, FN1910, however, a couple clarifications, at least as far as I'm concerned. Agreed that displaying your weapon just to walk past people who are paying you no attention is probably brandishing and is a good way to get a "man with a gun" called in. OTOH, if some thug is coming around my car and signalling very ill intent, I'd probably move to keep the barrier between us, open my jacket and growl that they've got the wrong guy. Hopefully, that turns 'em around.
As far as the the time during your draw and shoot giving the BG time to reconsider, that won't work for me. I know, for a fact (been tested on it many times) that I can draw from a concealed carry and plant a controlled pair to the thorasic cavity in less than 1.5 seconds. The BG better reconsider damn quick.
Merry Christmas to you!