On Moral Authorities

[Ignorant]

 if my list of help and harm differs from someone else's list then I'm okay with that.  We agree on help and harm, and that's enough to find common ground and make a sort of moral compromise between us if there is ever a conflict.

PRECISELY! Do you think there is a fundamental difference between "Help and avoid harm" and "Do good and avoid evil"? I don't think so.
We may disagree about what is helpful and what is harmful (or even the "what" we are helping or harming!), but we don't disagree that truly helpful things are good and truly harmful things are bad. The more helpful things in life, the better life is. The more harmful things in life, the worse life is.

Compare

We may disagree about what is leads to human happiness and what leads away from human happiness (or even in what happiness consists!), but we don't disagree that things that truly lead to human happiness are good and things that truly lead away from human happiness are bad. The closer we lead ourselves to human happiness, the better life is. The further away from human happiness we lead ourselves, the worse life is.

You are using different words to convey the same idea. But if you'd prefer to be your own category, have a ball!