If we define Moral Intuitions as the reactions we feel in response to our thoughts and actions and those of others.
If we define Normative Morality as the reactions we feel given for methods of decidability given some set of assumptions.
If we define philosophy (positive and literary) as the search for methods of decidability within a domain of preference, and
If we define truth (negative and descriptive) as the search for methods of decidability across all domains regardless of preference.
We find that personal moral intuition is the product of our genes, and our experiential development. And it varies greatly from individual to individual.
We find that existing normative morality is the product of evolutionary accident and we learn it through experience and observation – although it does vary a little from individual to individual within groups, and varies widely between groups.
We find that positive or literary philosophy(fiction or philosophy) informs, suggests opportunities, and justifies preferences for the purpose of forming cooperation and alliances between individuals and groups.
We find that negative or juridical philosophy(truth or law) decides, states limits, and discounts preferences, for the purpose of resolving conflicts between individuals and groups.
We find that juridical philosophy attempts to explain the common law, without necessarily succeeding at doing so. But that the transformation of juridical philosophy to juridical science is eminently possible – we just may not like what we learn, any more than we learned in each previous reformation of our thinking.
Natural Law (propertarianism), is a negative, descriptive, juridical science, not a fictional literature. It is not a rational philosophy limited to internal correspondence. Its not a moral norm. Nor is it necessarily a moral intuition that all would agree to.
It is the record of the arguments by which we decide conflicts over investments we have made, and protect. And from these records we can identify a very simple single law – non imposition of costs upon anything whatsoever that others have invested in producing whether informational, behavioral, material, or institutional.
And from those observations we may discover general rules. Just as in any other science.
And there is only one of them.