In his encyclical Aeterni Patris, Pope Leo XIII sought to advance the restoration of Christian philosophy against the modern trends of secular philosophy, emerging from Enlightenment rationalism. The critique of modern intellectual errors and the way in which such false thinking manifests itself in the world has deeply shaded my personal reflection on the tragedy of legal abortion.
As a matter of first principle, yes. As a matter of law, no, and such compromises are frequently necessary. Ross Douthat explains (is it just me, or does he seem somehow less influential as a New York Times columnist than he was as a blogger):
The argument for unregulated abortion rests on the idea that where there are exceptions, there cannot be a rule. Because rape and incest can lead to pregnancy, because abortion can save women’s lives, because babies can be born into suffering and certain death, there should be no restrictions on abortion whatsoever.
As a matter of moral philosophy, this makes a certain sense. Either a fetus has a claim to life or it doesn’t. The circumstances of its conception and the state of its health shouldn’t enter into the equation.