Your real problem here is that positions on abortion are views which are so diametrically opposed (there ain't much middle ground between "legal" and "illegal") that they -both- are equivalent to religious positions, not political arguments.
Even the terminology used to describe the two sides in the fight is selected to be sound bites: "Pro-life" (you aren't pro-death, are you), or "Pro-choice" (you aren't anti-freedom, are you).
Moreover, while abortion is technically "legal," that legality stands on a Supreme Court decision. The Supreme Court can change its mind. A lower court, though they often do not do so, can hand down a decision calling a Supreme Court decision into question.
Until there is an actual law, or Constitutional Amendment, one way or the other on the issue there will be endless debate that amounts to nothing more than religious dogma on both sides.
"Be ye not lost amongst Precept of Order." - Book of Uterus, 1:5, "Principia Discordia, or How I Found Goddess and What I Did to Her When I Found Her."
