I'll preface this post by saying I am a humanist, though I should say that I am not a Humanist in the sense of the actual philosophy of Humanism. I just think the word suits my own belief system better than any other word does. I believe in the supremacy of humanity over all other forms of life on earth. I assign value to other things in the world only based on the way they effect humans. I believe that the human intellect can eventually overcome any barriers, even ones that seem insurmountable currently. I realize that I would be in your category of people who give human life more credit than is deserved, and I don't think I can make an argument that would make you come around, so maybe the argument to follow is pointless. But despite that, I will try. This probably seems out of place but I think it provides context for my argument.
I'll start with:
I think it's human; I just don't care if it is or not. What does one life matter, especially when it's unable to biologically support itself? Let's look at it from a demographic point of view. If you were to outlaw abortion, every one of the millions of fetuses that would have been aborted would only add to the already insanely high world population. A population that's increasing exponentially, I might add. One life, and a sub-life at that, matters very little in the long run. The more people there are, the more strain is put on the planet to support said people, and eventually the world is going to overcrowd to the point where it becomes nearly impossible to sustain oneself. If you truly value human life, wouldn't that bother you?
This is not necessarily a bad argument, but I think it suffers because it requires that you divorce yourself from your own humanity. It could just as well provide a justification for murder. Could you feel comfortable making that argument to justify the actions of a murderer? Because there is nothing in that paragraph (except 'sub-life') that localizes it to the fetus case, and most of it, such as the insignificance of human life and overpopulation, would apply equallly well in any circumstance of murder. In fact, if we are looking at the long run, then not only one life does not matter, every human life doesn't matter. It is inevitable at some point that humanity should be extinct. What does it matter if it happens sooner or later? One life is infintesimally insignificant in terms of the universe; A thousand infintesimally insignificant lives added together is still infinitesimally insignificant, and the entire population of the earth is still insignificant in the universal framework. Under that logic, war, genocide, every atrocity thinkable becomes justifiable. So, even if your argument is technically sound, it is inapplicable without denying the entire notion of Ethics and ethical behaviour.
As to the final question of your paragraph, the answer is no. I believe Life > Death. Even starving; scraping for a meal, I would rather be alive than dead (a vacuous statement, considering that I am not in that position, but I am sincere as far as that can be useful). This is not universally applicable, as suicide exists, but I think that the least statement which can be made is that it is better to have the choice. Aside from which, I have already stated my belief on science and the human intellect. Canada could use a billion people. Tell them to come here
Overpopulation exists in India already, but I think it will be a long time before overpopulation can become a planetary phenomenon and I think that science will find a way to feed people regardless. Already, it is easier to grow more crops in less space, and those crops are more resilient to natural phenomenon like cold spells and the like. Eventually, I think food production will become much easier and I think that humanity is more likely to go extinct from other things before overpopulation becomes a problem like you describe, even if science fails us in that regard.
The United States is a country rooted in freedom and privilege
This is of course, true. The U.S. is based on a conception of inalienable human rights, and among them is the right to liberty. Also among them is the right to life, and that trumps liberty IMO. It is particularly the arbitrary assignment of these rights that I am contesting. I do not see why birth is held as the time when you magically receive your rights, and in particular I cannot see any legitimate reason surrounding birth which would make it impossible to assign these rights later in life. Whereas, I can see why you could assign these rights to conception. MY argument has always been that if human life means anything, it must logically mean something from conception, because there is nothing about birth that seems special enough to suddenly assign meaning to human life.
And of course, the reason why I do not believe that the mother has the right to kill her child is rooted in the belief that human life matters and that nobody has the right to take that life from another human being. I can't really expect this to sway you, having read your argument, but that is my view on the issue. I have to go right now, but if I missed any of your points that you thought were particularly compelling, or if you feel I misinterpreted part of your argument, please tell me and I will try to rectify that in whatever way possible.
@Arrow: I wasn't making any claim that because some women are anti-abortion, it must by necessity be wrong. And as I have argued in the above post and in previous posts, I do not think "to each their own" is a compelling argument in a case which directly threatens the life of another human being. It certainly would be ineffective in a courtroom if yoe happen to be defending a murderer. And I do consider it to be murder, as I believe it is a human life.