Actually, I have heard, states with concealed guns allowed, have lower crime rate, and are safer to be in. Are you going to rob a place if one of the workers or customers might have a gun in his coat pocket? No probably not. If you are almost sure that no one has a gun, there is no risk is there?
This is actually true, but there are only a few states that allow this. Minnesota is one but the the weapon has to be unconcealed (in sight).