@KoiwiGal - To some extent I agree with you, but I can also see it from the other side. There are people on the pro-life side who honestly feel that the fetus is a human life and shouldn't be removed because that would be killing that life.
Those people generally would agree with you, I think, that in some cases an abortion is warranted.
Then, there are people who think that any abortion is a crime against God, because he was the one who decided to put a child there and there are various biblical quotes to back up their cause.
They don't care about the lives so much as the spiritual well being of mother and child, and in their minds, any abortion will stop their entrance to heaven.
Then there are crazy people who just like to see things in black and white.
It's a complex issue. While your point is one I agree with, I'm not entirely sure abortion should be freely available in all cases.