Carrying a concealed firearm, and
not shooting it at the range leaves you with some protection no matter what. I think most range masters understand this (without discussing it) ... as long as it remains in your pants, so to speak.
Remember the famous April 1986 FBI shootout in Miami? (see
http://www.firearmstactical.com/briefs7.htm ) The BG's got their firearms by attacking citizens who were plinking out in the Everglades. That fact impressed me a great deal. I don't plink alone in the desert, and I make sure that whoever I'm with understands we have to be in condition yellow at all times. Knock on wood.
For that matter, considering the high prices of firearms, I'm pretty leery about leaving firearms alone at the bench while I go down range. I much prefer to go with at least one or two other folks so that someone can always watch our hardware when we're 100 yards away. Not that hard to have $500 to $1,500 invested in each gun ... I don't leave my keys in my car either.
Regards from AZ