Self ownership is fundamental and logically irrefutable!
Firstly it is important to correctly understand what is meant by ownership, it is simply - “The right to use”.
There is no contradiction in the owner and object of a right being the same thing. (If this were so then all individual rights would be impossible)
The clear contradiction arises when you attempt to argue AGAINST self ownership:
In order to make the claim that there is no right to self ownership (right to use ones body), one has to exercise the right to use ones body. Thereby demonstrating that such a right exists !
For a more rigorous explanation, Hoppe explains:
I demonstrate that only the libertarian private property ethic can be justified argumentatively, because it is the praxeological presupposition of argumentation as such; and that any deviating, non libertarian ethical proposal can be shown to be in violation of this demonstrated preference. Such a proposal can be made, of course, but its propositional content would contradict the ethic for which one demonstrated a preference by virtue of one’s own act of proposition-making, i.e., by the act of engaging in argumentation as such. For instance, one can say
people are and always shall be indifferent towards doing things
but this proposition would be belied by the very act of proposition making, which in fact would demonstrate subjective preference (of saying this rather than saying something else or not saying anything at all). Likewise, nonlibertarian ethical proposals are falsified by the reality of actually proposing them.
To reach this conclusion and to properly understand its importance and logical force, two insights are essential.
First, it must be noted that the question of what is just or unjust or for that matter the even more general question of what is a valid proposition and what is not—only arises insofar as I am, and others are, capable of propositional exchanges, i.e., of argumentation. The question does not arise vis-à-vis a stone or fish because they are incapable of engaging in such exchanges and of producing validity claiming propositions.
Yet if this is so—and one cannot deny that it is without contradicting oneself, as one cannot argue the case that one cannot argue !
Then any ethical proposal as well as any other proposition must be assumed to claim that it is capable of being validated by propositional or argumentative means. In fact, in producing any proposition, overtly or as an internal thought, one demonstrates one’s preference for the willingness to rely on argumentative means in convincing oneself or others of something.
There is then, trivially enough, no way of justifying anything unless it is a justification by means of propositional exchanges and arguments.
However, then it must be considered the ultimate defeat for an ethical proposal if one can demonstrate that its content is logically incompatible
with the proponent’s claim that its validity be ascertainable by argumentative means. To demonstrate any such incompatibility would amount to an impossibility proof, and such proof would constitute the most deadly defeat possible in the realm of intellectual inquiry.
It is also obvious that such a property right to one’s own body must be said to be justified a priori, for anyone who tried to justify any norm whatsoever would already have to presuppose the exclusive right of control over his body as a valid norm simply in order to say, “I propose such and such.” Anyone disputing such a right would become caught up in a practical contradiction since arguing so would already imply acceptance of the very norm which he was disputing.