I made a factual claim about morality.
If I were to have a glass of vinegar, if you were to pay me five dollars to drink that, I would say that's not enough to override my desire not to drink something gross. In this scenario, we can make factual statements about what is and isn't desirable based on factual claim about me as a person.
Similarly, we might say that if people want to live in a society, it is factually correct that it benefits everyone that they not kill one another. If not killing provides benefit for each other, it is factually correct that society where people don't kill provides benefit for people more than state of nature.
So basically, the proposition might go, if X is true about human nature, then Y would factually follow given X is true. So basically, if X, then Y. X, therefore Y.
Is this incorrect?