Right-Based Moral Theory

The idea of a right-based moral theory makes sense to me because I never thought of a goal-based moral theory as even plausible, and while a duty-based theory seems conceivable, there are many problems, as Mackie points out. There is something special about having the status of a right. It is complicated, however, when talking about moral rights, because "we are not looking for objective truth or reality in a moral system" (171). Where do these moral rights stem from then? "Moral entities" are "within human thinking and practice" (171). But this thinking and practice is varied and diverse. Perhaps there's not an umbrella moral theory that can cover such diversity? Mackie recognizes the diversity in arguing for a right of persons to choose how they shall live. This reminds me of the third-generation right to self-determination, except on an individual level. Mackie admits that the theory is individualistic, in one sense. I have a general understanding of his argument, but not a clear one, yet.