I don't support gun ranges or gun shops that forbid conceal carry. The way I think of it is if they cannot trust people with guns in their shops, they shouldn't trust the same people carrying a gun in crowded stores or shopping malls with children and other people present.. Also, considering a person will be handling a loaded weapon near me, if he cannot be trusted with a gun in the range, why should he be trusted handling a weapon sitting next to me? I want anybody I am shooting next to, to respect the rules of gun safety everywhere they go. If they won't respect the rules in the club house, why would they respect them on the range while people are walking up and gathering their targets with their backs turned?
If they are afraid of people pulling their loaded weapon on them, they can have a large sign telling people to leave their weapons holstered. Many guns store, including larger ones like Cabelas and Wholesale Sports all have these signs and most law abiding gun owners respect and understand these signs.
As far as gun shows are concerned, I can respect them possibly requiring people to not allow loaded guns there, assuming there is adequate armed security. If there is not adequate armed security, I will not attend a gun show that forbids me to conceal carry. Yes, a place with so many guns being handled in the open I can understand why people would be worried about people bringing loaded guns in, especially as some people will try to barter the guns at the show. However, I think a person is as vulnerable of being attacked at a gun show , let's say they are walking to their car with $1000s of guns. If thieves know that everyone at the show is disarmed, what a great opportunity it could be? Some gun shows have dark parking lots with inadequate security.