While I think the Misesian project avoids the problems with utilitarianism, I don’t think it by itself can provide a sufficient groundwork for libertarianism (i.e. a justification of the NAP). Hence I’m inclined to see the role of the Misesian project as a complement to the Rothbardian project.
Mises’ project is a value-free approach where the economist merely gives technical advice about which means are most suitable to achieving the ends people already have. In Mises’ words:
If the economist states the outcome of his investigation by saying that a is a bad measure, he does not pronounce a judgment of value. He merely says that from the point of view of those aiming at the goal p, the measure a is inappropriate.
But for the Misesian project to justify libertarianism depends crucially on the universal acceptance of the ends of peace and prosperity. Mises can advocate libertarianism to people who share these ends. But he cannot do so for people who don’t, e.g. nihilists, sociopaths, people with very high time preference. As Mises himself recognized:
We may, for instance, try to show a Buddhist that to act in conformity with the teachings of his creed results in effects which we consider disastrous. But we are silenced if he replies that these effects are in his opinion lesser evils or no evils at all compared to what would result from nonobservance of his rules of conduct.
Or as Rothbard pointed out, if people wanted unemployment, Mises would have to advise them to implement a minimum wage. Since Mises cannot criticize ultimate ends, he would have no choice but, e.g., to advise a nihilist to violate the NAP if that was the best means to achieving their ends. Hence I conclude that Mises’ value-free approach fails to justify the principled commitment to the NAP necessary for a libertarian society.
Now, Mises could take a different approach: abandon value-freedom and advocate libertarianism based on his own subjective preferences. This appears to be what Lilburne does here. But I don’t see how this can justify the NAP.
If nihilists go around promoting their subjective preference for aggression, and libertarians go around promoting their subjective preference for the NAP, how do we end up with libertarianism? If values really are subjective and arbitrary, then it doesn’t make sense to try and convince the nihilists that libertarian values are the right ones.
So it seems to me that, at best, the Misesian project can only provide a flimsy justification of libertarianism. As Rothbard put it: “Justice, not the weak reed of mere utility, must be the motivating force if liberty is to be attained.” Hence I continue to think that libertarianism without natural rights is not libertarianism at all.