@topic:
Abortions up to week ~16 I'm fine with, after that I think the preponderance of evidence indicates there is a ample reason to classify it as human life and grant it rights accordingly. My view is we have no way to discern when, exactly, it becomes human life so we are morally obligated to err on the side of caution. My best estimate is around week 18-22 (it is a range b/c not all pregnancies are exactly the same) is when this change in classification happens so I give 2 weeks benefit of the doubt on the earliest estimate and say week 16 (I go back and forth on the amount of leeway time constantly but the basic principle remains the same). Obviously this is for routine pregnancy only, other facters in rare situations change some of this, but I think anyone who argues about such an issue over the facts of rare cases to support a general view of the issue is already making a good case against their position so I generally don't go into those issues unless a debate shows signs of being substantively focused (ie very rarely).
So, in short by 16 weeks it's been around three months for the mother who should have discovered she is pregnant and had ample time to make a choice and still have plenty of time to setup the details as needed. By most standards this is pro-choice.
With that said I personally find late second and third trimester abortions to be sick, and am of the opinion that this is in fact murdering a human life.
I furthermore believe that anyone who takes a pro-choice stance of any sort without having done the kind of research necessary to be informed about what type of life they are supporting the destruction of is morally bankrupt. That anyone could put their support behind the destruction of any form of conscious life (or what is potentially a conscious life), particularly one that is arguably human, without at least some effort to be certain of their classification of that life is beyond contemptible.
I don't consider myself fully pro-choice for this reason actually...because I find the casual way in which most pro-choice advocates throw their support behind ending life, whether they view it as human or not, to be disturbing. People who are pro-choice need to consider that at some point it's not just an issue of a woman's rights anymore, at some point the child gets its rights as well. Recognizing that part of the debate is the issue of when that happens is an important step towards a positive discussion - some pro-choicers are there already and I have little or no issues with those who are.
At the same time I am also put off by pro-lifers for a similar reason, they only tend to see the rights of the fetus and rarely consider the rights of the mother or how they factor into the situation. A reasoned position has to fairly consider all of these factors even if they are later ruled out, and I don't think many consider it at all (Similarly to pro-choicers not all are this way).
That's my view on the issue pretty much in one post.
I don't expect everyone to agree but hopefully most will see the reason behind my conclusion, even in disagreement.