Joanie and Jeff, I never thought I would hear both of you defending the banning of guns. There's a lot of food for thought to digest here, I'll be back.
I wouldn't do it, I do not agree with it...but since it is their property they have a right to establish the rules on their own property.
A student I'll call "Biff", repeatedly asked the instructor on where to get a sign barring licensed individuals from carrying at his business. The instructor repeatedly stated that he knew of no source for obtaining such signs. Later on Biff started giving out more details on what he wanted for a sign. He wanted a magical sign that would prohibit everyone except for himself from carrying! To quote Biff, he said "I don't want any of 'THAT' going on around MY business".
There you have it -- bigoted gun owners who want to disarm everyone else and leave them vulnerable to criminals.