You really have to wonder what the people who put up those sign have been smoking. I mean ... seriously. The shooter at the Sandy Hook school shot out the glass to gain entry through a locked entrance door -- and these mental midgets think a sign is going to somehow be a magic talisman that will stop a gunman in his tracks at the door?
Of course not. They know that such a sign won't stop such people. They are trying to stop the idiot gun owns who have a need to fiddle with their guns while out and about. You know the ones, right? We discuss them here from time to time. They are the ones with guns that go off while standing in line, while in a seat in a movie theater, while standing at the checkout at Walmart in AZ, or that shoot a toilet in an eatery in Utah.
If they thought such signs would stop bad guys, then they would just put up a no robbery sign or no bad guy, but they don't do that.
This next guy hurt himself, a toilet, and a woman.
This guy managed to hurt a total of 4 people...
So folks think that by not allowing guns, the chances of something going wrong are reduced. Never mind they they occur at an extraordinarily small fraction amount of the time, even compared to bad guys robbing the place.