" From this it does not of course follow that there are no natural or human rights; it only follows that no one could have known that there were. And this at least raises certain questions. But we do not need to be distracted into answering them, for the truth is plain: there are no such rights, and belief in them is one with belief in witches and in unicorns. "

― Alasdair MacIntyre , After Virtue: A Study in Moral Theory