The first thing you never do OR I wont do is have my back to the door, don't care if its a coffee shop or at the movies.
IF.. you are carrying like its some kinda hobby then leave it the F-at home you do no one any favors putting your firearm at risk.
A, Leo buddy of mine was killed had his back to some dudes came in walked by casual pushed his face into the table the other grabbed his gun and shot him and left him for dead.then robbed the people there. ( there is more to it but that how he was killed.)
I know you guys don't know me from Jack, but that day not only was he killed, but others were robbed, for the love of GOD if you are going to O/C never ever, ever leave your F-N back to the door or anywhere. I only CC 99.9% and even then I will ask for another seat until I get the one I want. Paranoid.... nope lost a friend and he wasn't paranoid either.
And why I don't think it should be required by law, I personally think until you understand situational awareness don't get your C/C or O/C the rest of us don't want others to be victim of your inability.
I'm not as pissed at the two Joker's, as much as I am the dude that put everyone at risk not knowing what to do and putting himself in a very very bad position he could have easily avoided.
Don't sit with your back to the door period.