For the life of me, I will never understand why people don’t accept the validity of this. Rothbard went nearly his entire life without believing in a rational ethic and preached for years that such a thing was impossible. Upon hearing Hoppe’s argument he immediately changed his mind. I’m not trying to insinuate that just because Rothbard thinks a certain thing is so, that it must be right, but someone denying the axiom of argumentation and the neccesary knowledge that follows is no different than someone denying the action axiom and the neccsary knowledge that follows.
Hoppe describing the fact/value dictonomy:
"…there is the logical gap between “is-” and “ought-statements”
which natural rights proponents have failed to bridge successfully—
except for advancing some general critical remarks regarding
the ultimate validity of the fact-value dichotomy. Here the praxeological
proof of libertarianism has the advantage of offering a completely
value-free justification of private property. It remains entirely
in the realm of is-statements and never tries to derive an “ought”
from an “is.” The structure of the argument is this: (a) justification is
propositional justification—a priori true is-statement; (b) argumentation
presupposes property in one’s body and the homesteading
principle—a priori true is-statement; and (c) then, no deviation from
this ethic can be argumentatively justified—a priori true is-statement.
The proof also offers a key to an understanding of the nature of the
fact-value dichotomy: Ought-statements cannot be derived from is statements.
They belong to different logical realms. It is also clear,
however, that one cannot even state that there are facts and values if
no propositional exchanges exist, and that this practice of propositional
exchanges in turn presupposes the acceptance of the private
property ethic as valid. In other words, cognition and truth-seeking
as such have a normative foundation, and the normative foundation
on which cognition and truth rest is the recognition of private property
rights."