Religion & Law

To me it is clear that more than a thin conception of the good is needed to ground a just society. But I do not think that all liberalisms rely on a thin conception of the good. Martha Nussbaum?s conception of human flourishing is a far thicker conception of the good than that of John Rawls (though it is a secular conception). (Nussbaum is a religious Jew, but she does not believe religion should play a public role in grounding religious judgments). I wonder about the utility of arguing that Catholic social thought is politically (as opposed to theologically) superior to all forms of secular liberalism. Does such a claim contradict the claim of Catholic social thought to appeal to all human beings?