The title is one of the most common excuses I get when presenting pro-life reasoning. I often hear it after making these two simple claims:
1. Scientific claim: The unborn are human beings from fertilization. Therefore, abortion kills an innocent human being.
2. Moral claim: It is immoral to kill innocent human beings for 99% of the reasons given for abortion (i.e., everything except to save the life of the mother).
The reasoning is simple and sound, and I always invite them to explain where they are in error. That is when I typically get the “it isn’t black and white!” cop-out.
I’ve noticed that they never use the “black and white” claim when advancing same-sex marriage, trashing religious freedoms to force employers to pay for birth control and abortifiacients, pro-union propaganda, anti-school choice, universal health care, etc. That tells me that they aren’t arguing on principle but are merely wedded to their pro-abortion worldview.