That’s an interesting origin story. I suspect these ideas came about and came to possess a utility as larger societies formed. Nobody needs to be told that murder and stealing are wrong, we know it instinctively. It has been shown that primates understand this concept generally.

One problem with large societies is that customs becomes entrenched over time. We keep following the same rules and forget where they came from, we mistake the menu for the food. We cannot turn to a naturalistic solution to this problem, where everything is eating everything else because that amounts to fascism. Instead we must settle for a kludge where rich people get a different type of justice than do the poor, sentencing is more punitive before lunch and many other idiosyncrasies. My point is, I don’t want to forget that a menu is just a menu. Some things will always be true and the law is not one of those things.