I just reread it, and I think I see what you mean. What I was trying to say is that all laws (that I can think of) are based on ethical considerations to some extend. They are, in a sense, codified and enforced moral imperatives. Whether we think a law is fair or not depends on whether we agree with the moral foundation of that law, and for this reason I think Lemur866’s claim that moral arguments are superfluous when discussing abortion legislation is incorrect.
I agree that the pro-choice stance encompasses several moral positions on abortion: if you think having an abortion is perfectly ethical, or if you think it has no moral implications whatsoever, you’re automatically pro-choice, but it is also possible to be pro-choice if you think abortions are immoral, or if you just aren’t sure. What matters is that you are prepared to admit that it is basically a personal choice; ethically correct or not, it remains a private matter and the state shouldn’t interfere.
The only position that the pro-choice stance can’t include is the one that sees abortions both as immoral and as a public matter. If one sees abortions as a situation in which one person causes severe and ireparable injury to another person (the foetus) then it shouldn’t be that difficult to understand that one might draw the conclusion that abortion should be considered on a par with other forms of interpersonal violence which aren’t, generally speaking, considered private matters. If this doesn’t seem to make sense, consider how most of us, pro-life or pro-choice, wouldn’t want to abolish laws prohibiting homicide, assault, sexual abuse, and so on, because we don’t think those are private matters, the morality of which everyone should be allowed to decide for themselves. In those cases we would want the state to interfere, and so we make it a public matter through legislation.
Here again the issue of how a foetus is defined pops up. It is the belief that the foetus should morally and legally be considered a person, combined with the opinion that killing another person can never be condoned, no matter what the circumstances, which takes the matter out of the sphere of private morality and makes it a crime. If you don’t share either one, or the other, or both of these beliefs (which I don’t) then you have no problem arguing that abortions should remain legal. But in order to convince someone who disagrees with you, you would have to dissuade him or her of at least one of those two beliefs. If you wan’t to do that, then neither moral arguments, nor the person/non-person status of the foetus is irelevant.
I hope I’ve made myself clearer, even if I’ve mostly been repeating what I’ve already said before. Also, I’d like to apologise if I’ve come off sounding condescending; I just meant to make sure my point is as obvious as possible.