I think familiarity breeds contempt,or at least the perception of such.I have seen poor muzzle control among elite combat troops in dangerous situations where an unintended discharge would likely have seriously impacted the outcome whether anyone was hit or not.One of my best friends was killed in Vietnam by such a discharge. The guy behind him had his muzzle pointed at Bob's back and when he stumbled he pulled the trigger and sent a bullet into Bob's rear end. Bob died on the operating table. I have never been polite when correcting an errant muzzle and make no apologizes for it.