If anything, the Hollywood-concocted myth about guns firing on impact inspires us to be even dumber with guns. If you drop a gun, your first instinct will be to try to catch it before it hits the ground, because movies taught you that gun + ground = death. In real life, however, grasping for falling objects is an inherently imprecise act, and you run the risk of accidentally catching the trigger while you fumble around like an idiot trying to catch it. Which is why experts agree: It's much safer to let a gun fall than to try and catch it.
Even has a link to Box of Truth.
Though for an article about how dangerous Hollywood's gun myths are as its thesis, there's no mention of the other flagrant safety rule violations. Oh well.