I will attempt to approach the arguments of “self-sovereignty” and of a “counsciousness threshold” of humanbeingness at once. I’m evidently not a legal scholar (nor Austrian, for that matter), so please correct if I’m saying something stupid here. And forgive my weak command of the English language, I will attempt to make my point as much clear as it is possible.
My understanding is that any useful notion of “self-sovereignty” is conditional to the respect of the general law.
If the law establishes that the slaughter of foetus is an unjustifiable act of violence, and therefore a crime, forced intervention is justified.
The law being a set of rules and guidelines taken as an a priori to the consequential action being judged, and a lawful judgement being the prescription achieved through the comparison of a perception of what is the statement of law and what was actually or presumably known by the given actor whose consequential action is being judged.
So the question is whether abortion is understood as an act of violence and if so, under which conditions it can be justified.
Since abortion is, by definition, an act of extermination of an individual living organism, it is our task here to figure if this individual is entitled to certain rights that are violated by such act.
My point is that there is no validity in denying the foetus the same rights of small children and the like. Any attempt to encapsulate humanity in some sort of bodily structure is void of deontological meaning. Our notion of a human being cannot be subordinate to our precary understanding of consciousness or when it starts being relevant. Some could argue the threshold of consciousness is the acquisition of natural language self-referential capabilities by the age of 2 or 3, for instance.
Since the foetus is not deprived of its rights as a notional human being, it is now time to consider Rothbard’s argument that she is an intruder or parasite that can be evicted by her host.
This argument is correct whenever the host cannot be held responsible for the condition. If the host had been raped for example.
This argument is not viable in the general situation, when the vulnerable and dependent condition of foetus was established as a result of consequential actions of her mother. In that case, the mother can be held responsible for such state of affairs, and forced by a lawful judgment of her actions to provide the basic needs of the foetus and child until it acquires an acceptable level of independence, which may also be predefined by the law.