Gary Becker joined this ongoing debate two weeks ago. His conclusion:

This is why classical libertarianism relies not on the assumption that individuals always make the right decisions, but rather that in the vast majority of situations they do better for themselves than government officials could do for them. One does not have to be a classical libertarian–I differ on some issues from their position–to recognize that the case for classical libertarianism is not weakened by the literature motivating libertarian paternalism. Indeed, when similar considerations are applied to government officials and intellectuals as well as to the rest of us, the case for classical libertarianism may even be strengthened!