Simply as a probability exercise, you are correct. The same will be said for any GFZ, like a school.
You seem to be missing the critical point here. With the exception of a gun show, it is generally illegal or at least highly discouraged socially to be handling a firearm out in public. This is the key difference.
... and EACH PERSON there, including the exhibitors and the attendees should conform to ALL firearms safety rules, or not be in the room. ... I make the assumption that ANY person sighting a firearm at another person is assuming harm. In a gun show or store is no different.
I'm afraid I've failed to see why we have a disagreement. I've been dealing with reality while you seem to be dealing with some grand theory.
Have you actually attended a gun show? Do you REALLY react the same way to someone handling a gun at a gun show that you do to someone handling a gun in a grocery store, at the mall, or at a school?
Do you REALLY expect, even demand, that inside a crowded gun show nobody ever point a gun in an unsafe direction? That they never put their finger on the trigger when they don't want the gun to discharge?
That simply isn't reality at any gun show I've ever attended. Sure, it is bad form to deliberately sight in on someone. But to momentary cover someone or something that you have less than zero desire to put a hole in? Simply not possible to avoid that in any show large enough to be called a gun show.
Do you just assume the guy handling his gun, working the slide, maybe even sighting it on nothing in particular out and about in public is doing nothing amiss?
Conversely, do you really assume that everyone inside a gun show who might inadvertently sweep or cover you with the muzzle of gun is intending to murder you? They must love you at the shows.
I could snidely suggest that you come back to this discussion when you are ready to deal with reality.
Instead, I'll suggest, for what it is worth, that you just avoid going to gun shows until you are the one running the show.
Charles