Why does anybody care why someone will or will not patronize a (insert place) because of whatever reason? If the answer is "the (insert product/service) is so good, it is worth setting aside your ideological differences for", I could at least entertain that, but all I am reading is presumptuous, character-profiling.
I carry a firearm almost everywhere I go that won't get me arrested or fired. Of course I respect the rights of business owners, private property and what have you, if you do not wish to have non law-enforcement armed, I will decide which I prefer, carrying or whatever you're offering. I will almost always prefer to be armed, and that's my worldview, and right.
As to the entirely hypothetical, wholly subjective, and therefore pointless, exercise in "how one would react" in a high-stress defensive situation, there are so many variables, a sweeping generalization is sorely inadequate on both sides. One must accept that there are more possible outcomes than "scaredy person does nothing and helps no one" and "hero person saves everyone and therefore proves everyone should carry" (of course both of those scenarios are assigning a responsibility to the carrier that 1. he doesn't have, and 2. he shouldn't walk around thinking he has).