It seems like a lot of this disagreement is semantic...
While I agree that this is a fine point to assign personhood, I must still contend that there is no objective justification for it. It is a useful convenience, not an absolute. You point to the bio-mass's dependency on the host as justification, so I will note that other than processing its own oxygen, the biomass is equally dependent (both physically and legally) on the host. It cannot move effectively, it cannot maintain its own body temperature, it cannot sleep for extended periods of time for lack of energy stores. You say that an unborn baby is unable to exercise self-determination for want of basic abilities, so I will note that the same is true of a born biomass.
I think that what has been meant is that the nature of a foetus and the nature of the hose, taken together, are sufficient to justify killing the creature, since the will (in the most general sense) of the host trumps that of the foetus--the nature of the will being decided by the nature of the being. With what they are concerned is not just the one or just the other, but the
difference in value between the will of the host and the will of the foetus. (Again, this is will in the generalized sense.) This is why 'personhood' is mentioned so much--because it determines the value placed upon the foetus's will and thus is paramount to deciding upon whether or not abortion is permissible.
Now, when the creature is born, the will of the host is no longer a factor, and there is no-one (whose opinion is of legal concern) who can say that the creature should be killed. (I trust it obvious that the host qua the host's wish for it to be killed is of legal concern.) It is assumed that the state is then responsible for ensuring the child's upbringing.
I think that better explains the pro-choice positions in this thread thus far.
That will play very nicely with the pro-life crowd. And to what gain is there?
If you can provide a superior alternative, your objection will be vindicated. Otherwise, it's just quibbling over how many grains of sand make a heap.
The majority of abortions occur in the first 13 weeks of pregnancy; if personhood was granted at the beginning of the start of the third trimester (which is around when the biomass becomes viable enough to live outside the host), it would not hinder a single one of those abortions. Is there a need to keep a biomass from having personhood at, say 35 weeks? 34? As long as there are considerations for the health and safety of the mother, there is a "grace period" of perhaps three or four weeks in this matter; personhood could be conferred at any time during that and I'd be amazed if even two abortions were prevented.
Now, see, this is an inferior alternative. There is a qualitative difference between the situations of a foetus and a newborn, as I and the others have explained. What you suggest here is a quantitative difference that doesn't actually agree with the pro-choice positions in this discussion thus far. So, such a cut-off point (for a formal, comprehensive overview of cut-off points, refer to
Curb Your Enthusiasm, David et al., 2000) for abortion would be not only extremely tenuous but also inconsistent with many pro-abortion arguments. This would give anti-abortionists much more leverage than using birth does.
Your concern that pro-choicers don't appreciate the deeper questions is a good one, and you'd be right if you said that many haven't done the philosophical work to have a strong pro-full-term abortion position or that the prevailing pro-choice arguments are incomplete. However, the way you seem to be going about conveying these things is, ironically, overshadowing that message.
The disadvantages of basing any pro-choice argument on the specific time point of birth are great, while the advantages are few.
But you still haven't provided a better alternative.
As far as defensive positions go, "personhood at birth" is more of a sand castle than a Bastille.
Again: Our (to whomever 'our' may refer) concern is not with finding a 'perfect' solution, but with finding the best from an infinity of choices. Sand castle or not, the best proposal I've heard is birth, so that is with what I go.
But even a wiff of it as a justification for abortion is detrimental.
I don't understand you here, but it sounds like you might be here thinking that we see no qualitative difference between postnatal termination and abortion. If that's the case, you're thinkin' wrong.
The thrust of my argument is that any justification of abortion partially based on the nature of the unborn child is undesirable, ineffective, and ultimately harmful.
Can you provide a superior alternative method for determining the validity of abortion to the ones that refer to the nature of the foetus? The method I explained above that is concerned with the relative wills of the host and foetus and which I think pretty much represents the others' position is pretty strong.
But to me, as long as the baby is in a woman, it's a part of that woman. It is not yet an independent person--it is simply a part of the mother's body. And women should have the right to do whatever we wish with our own bodies. To me, the personhood debate is pointless at any time before birth. It's not yet a person. It's only a part of another person.
You seem to presume that the foetus being in the host means that it is 'part of the host' and therefore just like a nail or a hair or something. But later on, the foetus is so much more than any of those things and might even survive outside the host. Certainly it is inside the host, but it has a body of its own and, later on, is a separate organism by any vaguely sensible notion of 'organism' of which I know.
This is part of why I use words like 'host' and (though I haven't here) 'parasite'; they are more general, precise and accurate. For example, the foetus being (like) a 'parasite' shows how the host and the foetus are different organisms and much besides that we do well to remember in abortion arguments.
By denying the personhood of a biomass, pro-choicers are allowing that to be the point where pro-lifers are defending. It is giving them something to hide behind and it allows them to ignore the matter of a woman's rights. But if that is no longer the battlefield, what can pro-lifers hide behind?
The notion of personhood is important here as a way for the masses to approximate the idea of the differences between the host's will and the foetus's will. Similarly, the legal notion of personhood at birth is much more accessible than a comprehensive nuanced legal framework that accommodates full-term abortion.
It's like how one wouldn't have expected the early feminists to have used the relatively advanced feminist theory that has since developed to justify female suffrage; the basic notion of male-female voting equality was enough, and advanced theory actually would have been less productive. Or it would be like trying to introduce Quantum Mechanics to the Stone Ages; you wouldn't be able to make the people then see or understand your theory, and you'd be better off teaching them Classical Mechanics or so forth. (Note also in these analogies that the more powerful theories were
built upon the earlier ones. There's something to be learned from that.)
One of the great criticisms of the pro-life side is that it is sexist. While this might be true in effect, it is much more clouded in practice. That is, it is very possible for a pro-lifer to focus on the "saving lives" aspect even if they might be horrified of the prospect of engaging in sexist behavior. But if that distraction disappears?
Yes. This is something that the pro-choice movement would do very well to observe more. The right have shifted the terms of much of the debate so that the pro-abortion side is defending itself from accusations of murder and so forth. Whereas, the terms of debate should be more in terms of the anti-abortion side putting the survival of a few stem cells (simplification but you get the idea) or a parasitic creature of instinct over the developed will of a definite person. If this horrific and horrifying view were seen, we could finally move on from scrapping for abortion rights.
But that tangent aside:
¡Hell yeah 'soon'-to-be Motherfucking Mr. Doctor Thought!