Washington Arm Collectors have had a couple of ND's in the past. Innocently happened but never-the-less very scary as there were a lot of people around and in one incident a person was wounded.
Sorry to say, I think they are justified as with any large group of people, there are bound to be a few who are incapable of rational thought.
No I don't like my CCW being emty and tied up. But consideration for the folks at the show and the membership I will comply with their rule. Also, I've been a member for almost 20 years.
I have two choices. Go or don't go. That also applies to other places that chose to not allow firearms. Seems simple enough for me.