"We're faced then with two intriguing mysteries. Why did the Nozick of 1975 confuse capital with human capital? And why did Nozick by 1989 feel the need to disavow the Nozick of 1975? The key, I think, is recognizing the two mysteries as twin expressions of a single, primal, human fallibility: the need to attribute success to one's own moral substance, failure to sheer misfortune. The effectiveness of the Wilt Chamberlain example, after all, is best measured by how readily you identify with Wilt Chamberlain. Anarchy is nothing if not a tour-de-force, an advertisement not just for libertarianism but for the sinuous intelligence required to put over so peculiar a thought experiment. In the early '70s, Nozick—and this is audible in the writing—clearly identified with Wilt: He believed his talents could only be flattered by a free market in high value-add labor. By the late '80s, in a world gone gaga for Gordon Gekko and Esprit, he was no longer quite so sure."
Stephen Metcalf in Slate ponders why libertarian philosopher Robert Nozick abandoned libertarianism.
And a few days later, Metcalf responds to his critics.