Kalt, that can’t be right. If I’m understanding your summary correctly, every society has its own moral code that is shaped by the exigencies of life in that society/culture rather than by the intuitions of a transcendental morality of some kind. Neverthless, I submit to you that we certainly we can judge moral principles, on at least two grounds. First, functionality: i.e., whether the principle is adaptive. In that sense, a moral principle can be good or bad. Alternatively, we can judge moral principles on empirical grounds; e.g., whether virginal sacrifices do in fact prevent droughts.
Some ethical precepts, I think, are universal. But defining these norms is very difficult, because in doing so we risk being dogmatic or parochial.
Why does Posner talk about this? Why are many lawyers – especially conservative lawyers – moral relevatists? It’s all because of complaints about the Warren court, the charge that the Supreme Court, in constitutionalizing abortion, for example, was imposing its own values upon the majoritarian political branches. Bork, and Posner, think that this is wrong somehow – that the Court shouldn’t impose its moral views on others, because morality is relative and the polity should be free to divine its own moral code.
Here’s the punchline: that argument means that some value choices must be legitimate. Otherwise, if all value choices are subjective, then it could not be said to be wrong for the court to impose value choices on the rest of society.
I mean, sure, in any kind of heterogenous society, disagreements about morality and values are inevitable. People will come to different conclusions when asked to make moral judgments; this is a function of irrationality (people don’t think things through), conflicting self-interests (the desire to conflate self-interest with “good”), and the difficulty in assessing/weighing evidence, as shaped by people’s different personal experiences (e.g., I never see babies so don’t think fetal life is precious).
Therefore, the government shouldn’t be dogmatic in making moral choices. But that doesn’t mean that we as a society must retreat to the formalistic minimism espoused by Bork, Posner, and other relevatists. That’s just ducking the hard questions.
People have tried to answer these hard questions. One group (with which I pretty much agree) kind of goes along with what SentientMeat was saying. Moral judgments are justifiable if they are Pareto superior, to borrow a bit of economists’ jargon (i.e., make at least one person better off and no one worse off). But the status ex ante must be justifiable as well, in that there is equality in the assignment of basic rights and duties. I guess as a corollary I’d say that social and economic inequalities are just if and only if they result in compensating benefits for everyone, in particular the least advantaged members of society.