They have signs posted everywhere. Outside before you get to the door. Every gun show I've been to has been this way over thirty years. But especially now.
Were you at that specific gun show?
Have you been attending shows in that area for all those years?
I'm not necessarily disagreeing with you, but I am inclined to give the benefit of any doubt to the owner of the weapon, and not to the cop who wounded innocent bystanders with it.