Well written post, and an excellent way of expressing the reasons behind a change in policy that people have highlighted as... Well, frustrating.
Denver Comic Con this year actually implemented the "No Gun" policy, however, it wasn't handled well in my personal opinion. The policy on Prop guns was put in place the day of the Con, and people sadly just weren't being informed on time, not until they reached near the front of the line, in some instances. From there, cosplayers had to go to the opposite end of the building, turn in their prop (Which I hadn't even been told this by the time I was there, and had to ask three different staff members inside the con as to why my weapon hadn't even been inspected or anything of the sort, just taken and put under a table), and had to go to the end of the line. People managed to easily sneak weapons in, or at least did so on day 1. Saturday was a nightmare for cosplayers unto itself.
Now, I'm not saying anything about the policy itself as a gripe about "Oh, no gosh darn guns, dis con sucks", but more so to point out that I think the policy makes sense, but I do hope that they implement it in a much neater fashion. In similar circumstance to Kaween's statement on GC, the timing was WAY off, and the only reason people outside the con heard about it was because a news reported about it, or so I heard. The most troublesome thing is the fact that I had to ask several people about the policy, which meant not all staff knew about this policy.
I suppose what my rambling actually means is that while I'm fine with the no gun rule, I just hope for it can become a cleaner and better policy, rather than the somewhat nightmarish thing I personally ended up seeing there. FANGS is right- We live in a time full of uncertainty. I think the idea of erring on the side of caution and removing guns is a good thing. I just hope that cons that decide it can refine it so it doesn't end up making people angry or upset, and hurts the con's value itself.