Maybe they figure most "ND's" are from Doofus's who open carry and then show other doofus their gun while sitting around in the building and BANG!
Another point is the “no loaded firearms” in the building rule. This rule has been in place for over 20 years...if you are concealed carrying, please feel free to do so. We do have a “no holster draw” rule on our general firing line though. Because of this rule, we cannot accommodate open-carry configurations. More often than not, our customers desire to shoot their open-carry piece. Since the general firing line is not set up to accommodate draw and presentation, we had to make a range rule that open-carried firearms must be made safe (mag out, slide locked open, safe-chamber indicator inserted) before proceeding to the firing line. Other ranges have similar rules for the same reason: it is impossible for a shooter to draw their piece from the holster without another shooter being in front of the muzzle. However, unlike most other ranges, we are working on a solution - we have plans to accommodate draw and presentation practice on another part of the range. We feel that this skill is a fundamental that should be practiced by anyone that carries a self-defense piece. This skill should also be practiced in a location that doesn’t put other shooters in danger. We want to accommodate - thank you for your patience!