In my opinion, I think that the rabid pro-aborts are trying to internally justify involvement with a past abortion. If the abortion was the killing of an innocent human life, the guilt eats them up. If the abortion is a choice, they can live with it.
Most people are tepid about the issue. Some pro-lifers are passionately pro-life because they realize what happens to the unborn baby during the abortion and it sadden and sickens them. Or because they are religious and the baby is God's creation. Or because they don't like that there are so many abortions for convenience sake and they think we should stop, take a breather, offer limited abortions.
The pro-aborts are either pro-abortion (abortion on demand throughout nine months, no questions) because to be anything less is to acknowledge that the unborn "fetus" is a human being. Then there are the "pro-choicers" who really haven't thought much about it, but don't like the idea that "government" is involved in personal decisions (great PR campaign on the pro-abort side). They somewhat acknowledge that abortion is bad, and most don't support abortion after the first trimester, but they aren't ready to acknowledge that the "lump of tissue" in the first twelve weeks is a human being. It's a disconnect.
Anyway, that's my opinion. The vocal minority of pro-aborts is guilt. They need the assurance that they aren't murderers.
There's a lot of wisdom in your #50, I think. Well-put.