You can deny all you want that there is etiquette, and a lot of people do in everyday life. But if you behave in a way that offends the people you're trying to deal with, they will stop dealing with you. . . There are plenty of people who say, 'We don't care about etiquette, but we can't stand the way so-and-so behaves, and we don't want him around!' Etiquette doesn't have the great sanctions that the law has. But the main sanction we do have is in not dealing with these people and isolating them because their behavior is unbearable.
I do believe that half a dozen commonplace attorneys could so mystify and misconstrue the Ten Commandments, and so confuse Moses' surroundings on Mount Sinai, that the great law-giver, if he returned to this planet, would doubt his own identity, abjure every one of his deliverances, yea, even commend the very sins he so clearly forbade his people.