It's really no different than pointing an unloaded weapon at someone. It's just as safe...although pointing an unloaded weapon at someone is generally accepted as something you don't do because even if you know for certain that the weapon is completely and totally empty and devoid of any ammunition. YOU ARE THE ONLY ONE THAT IS CERTAIN OF THIS.
Therefore as a good safety measure, you never point an unloaded gun at someone. Remember, not everyone is as safe as you would like them to be...and accidents do happen.
No need to let all the idiots think that an unloaded weapon can't fire, because eventually, they will screw up - it will be loaded one time - and they will shoot someone.
I was raised to believe that there was not a problem with it because an unloaded weapon cannot fire. Yet to be on the safe side, you just don't do it as yet another backup safety measure. As safe certain as you may be, accidents can always happen. You just might screw up one day!!
When it's in the case...people just accept it at that point I guess