At root, morality is an imperative - do this! do that! If you can follow up the imperative with sound reasoning, all the better. The cleverer and more articulate you are with the reasoning the more chance you have of your will being implemented and the particular moral matter being upheld. If you have power and status in the world on top of that then even better again.

I think this is what morality is centrally. There is nothing necessarily true about a morality. It is partisan in that it serves the interests of a particular individual, or group, or world view, or philosophy. To speak of a moral truth is only a linguistic convention open to confusion and giving rise to the myths of tablets of stone, a transcendent authority and the likes.

This does not have to demean the value of morality, that it is mainly an instrument of coercion. It’s better to coerce by words and reasoning than by physical violence. Like democracy being better than tyranny, reasoned morality is better than brute force. But we should understand nevertheless: coercion is at the heart of the moral law.