The new Libertarians are still trying to push the Enlightenment principle of self-governance (individual sovereignty) as far over as it will go, without collapsing into anarchism. But they’ve divorced themselves from the ground that made self-governance possible in the first place: a commitment to virtue. That commitment can come from religion, or a shared set of philosophically derived metaphysical commitments. But the end result is an individual that has a commitment to the good life, as a life lived in the pursuit of excellence (and, arguably, measured against the transcendent values of truth, goodness, and beauty). Single mothers, whoring themselves out in order to pay for their 15 year old daughters’ birth control pills is about as far from that ideal, as you can get. And that is what the Libertarian needs to grapple with.