Arbiters Of Morality?

Jonah Goldberg writes:

It is, for example, absurd that we’ve decided the Supreme Court should be the final arbiter of morality in this country and it is even more cockeyed that, having arrived at this absurd place, we continue to appoint lawyers to the court on the assumption they are the experts best qualified to adjudicate not merely the law (which is fine, of course) but right and wrong and all of the mysteries of metaphysics and meaning. Why lawyers? Why not priests, doctors and philosophers too