Tsze-Kung asked, saying, is there one word which may serve as a rule of practice for all one's life? The Master said, Is not Reciprocity such a word? What you do not want done to yourself, do not do to others.
Ideally citizens are to think of themselves as if they were legislators and ask themselves what statutes, supported by what reasons satisfying the criterion of reciprocity, they would think is most reasonable to enact.
We see things like reciprocity which are fairly central to our view of ethics.
But if you're talking about a set of worked-out rules on what we are supposed to do then, yes, it is a human product.