The principle of egalitarian individualism is regarded as axiomatic.
Curiously, he directly addressed the issue of the relationship between the modern axiomatic method and eternal mathematical truth.
Indeed, he writes as if there is a unique, univocal axiomatic-deductive method regardless of goals.
Using an axiomatic approach to entropy we prove that there is basically only one reasonable measure-theoretic entropy notion on doubly stochastic operators.
And it would seem axiomatic that moral goodness is the same for all rational beings.
We can presume that guideline developers are rational decisionmakers but not with the axiomatic precision demanded by rational choice theory.
This particular functional form can be defended on (what to me is) a reasonable axiomatic basis.
Still, inability to incorporate emotions in axiomatic models highlights the need for a comprehensive theory of functional rationality.