(separate reply, so you can downvote either or both points)

I don't think anyone's tried to poll abortion feelings on LW, and expect the topic to be fairly mind-killing. For myself, I tend not to see moment-of-birth as much of a moral turning point - it's about the same badness to me whether the euthanasia takes place an hour before, or during, or an hour after delivery. Somewhere long before that, the badness of never existing changes to the badness of probably-but-then-not existing, and then to the badness of almost-but-then-not-existing, and then to existing-then-not, and then later to existing-and-understanding-then-not.

It's a continuum of unpleasant to reprehensible, not a switch between acceptible and not.