What is "property" other than a state-enforced claim to ownership? If the state (read: society) decides to take some back it is well within its "right" to do so, as your only claim to property is based on decree of society.
I am a fan actually, and I don't think my views are incompatible with his. I do have reservations of the typical use of "natural law" arguments though. One can construct a natural law argument for just about any premise one wants.
