As a moral philosopher, Nozick was free to stretch liberty further than even an Austrian economist. That is, he was able to separate out a normative claim (that liberty is the fundamental value of values, and should be maximized) from an empirical claim (that the most efficient method for allocating goods and services is a market economy). Free to pursue liberty as a matter of pure principle, Nozick let nothing stand in his way. Should we tax the rich to feed the poor? Absolutely not, as "taxation of earnings is on par with forced labor." (Or more precisely: "Taking the earnings of n hours of labor is like taking n hours from the person.") Well, isn't at least some redistribution necessary on the basis of need? "Need a gardener allocate his services to those lawns which need him most?"
To the entire left, Nozick, in effect, said: Your social justice comes at an unacceptable cost, namely, to my personal liberty. Most distressingly, to this end Nozick enlisted the humanist's most cherished belief: the inviolability of each human being as an end unto himself—what Nozick, drawing on Immanuel Kant, calls "the separateness of persons." For Nozick, the principle of the separateness of persons is close to sacred. It affirms, as he writes, "the underlying Kantian principle that individuals are ends and not merely means; they may not be sacrificed or used for the achieving of other ends without their consent. Individuals are inviolable." . . . .
See, too, the following responses:
- "Nozick, Libertarianism, and Thought Experiments" by Julian Sanchez (here: http://www.juliansanchez.com/2011/06/21/nozick-libertarianism-and-thought-experiments/) and
- "Misunderstanding Nozick, Again" by David Boaz (here: http://www.cato-at-liberty.org/misunderstanding-nozick-again/).