By all means, TMN, if you are that fearful that the gun or the gun owner will suddenly go berserk and start spraying bullets, call every business you've patronized, and request they ban guns entirely (a concealed carrier isn't really much different from an open carrier). I'm sure you'll find your life much simplified, immediately and over time: some businesses will have the sense to politely decline your request (or maybe tell you where to go, how to get there, and draw you a map); some will do as you request, but change back when they learn how other customers view their ban; some will do as you request, and some of those will lose enough business that they will go out of business. You might even save some $$, TMN, between places you patronize going out of business and your refusal to patronize places that serve open carriers.