As it should be. If it is not a crime to carry a firearm, then the police have no business questioning a citizen who is exercising their constitutional right.
Remember the guy that was an open carry guy that took down that little wanna be mass shooter at the Greenwood Mall in Indy?
That mall was a no gun zone. If he had not been carrying many more people would have been killed.
Why would store owners want to be at the mercy of criminals?