Ever walk on the second floor of your house while wearing a conventional holster on your waist?
Guess what...you are also violating Rule #2 - the only difference is that you can't actually see the tops of the heads of the people walking and sitting on the first floor beneath you.
That does not mean that they are not there - and the fact that you can't see them does not mean that your bullet will not travel right through the floorboards and kill them.
Just some food for thought for you to chew on.
