Even if the gun went off by itself the Airman is still most likely negligent. The first rule of firearms is that you only point it at things you intend to destroy.
I agree and disagree. A holstered pistol is intended to be treated, for all intents and purposes, as deactivated and "on safe" for practicality reasons, even when loaded. Plenty of people carry loaded guns pointed at their bodies daily in holsters, safely at that.
Absolutely no one who carries holster relies on the rule of it not pointing at anyone. Surely they don't disarm every time they go up a second story, separated by the first only by 3/8" bit of plywood and sheetrock.