Don't be too much of an apologist. The current pro-life movement is very much tied to the resurgence of the evangelical right. Abortions were much more contentious before because we didn't have safe medicine to perform them. But the current climate where its a hot-button issue is absolutely a result of the same beliefs I described above. Why else would pro-choice not be the default, allowing anyone to choose to keep their child or not? There is a current of "belief in the face of any and all evidence" that keeps the pro-life movement committed, and the overlap in demographics is well-known.