Doug Wilson makes an important point:

So here is the problem. When a child is conceived in a rape, there are three parties involved in the consequences — the rapist father, the victim mother, and the victim child. This standard political response blurs over this reality completely, but this blurred reality sums up all the issues in the entire abortion debate.

If pro-lifers are correct, the unborn child is a person created in the image of God. As a consequence, it is a monstrous iniquity to execute him for the crime of his father. We are saying, in effect, that the guilty party will not be executed, but that one of the victims will be. What kind of thoughtful compassion is that?

Source: Blog and Mablog.

I have addressed this issue here and here and here and here and here and here.