We have a few mini-mart service stations that keep the "No Weapons Allowed" signs up - a few of them have been robbed at gunpoint and I haven't heard of any of the others being robbed - also noted is that the local LEOs frequent the gun-friendly places and I've had conversations with some of the Sheriffs about my carry piece with no perceived problems from them....pretty friendly and decent crew in my neck of the woods.
Point being that it was a "yute" who thought he had an easy target...