I’ve heard a few prolife thinkers take the position that it is wrong to use the biological tissue of aborted fetuses for medicinal purposes on the grounds that such a practice would encourage additional abortions. I’m not sure I agree with this line of reasoning, however. Consider the practice of using the organs of those killed by homicide. Should we be opposed to this on the grounds that it will encourage additional homicides? Surely not. The motivation for homicide is not to provide a fresh supply of organs for the born, but hatred for the individual who was murdered. Nobody commits murder so that they can increase the number of organs available for transplantation; therefore, there is no reason to believe that using the organs of homicide victims will increase the number of homicides in the future. By the same token, the motivation for abortion is not to provide additional biological tissue to help the born, but because people do not want the children they conceived. While an unborn child should never be killed, if and when an unborn child has been killed, I see no ethical problem in using its tissues to aid the born. After all, one is not doing evil (abortion) to accomplish some good (helping the sick), but trying to find some good (helping the sick) from an evil (abortion) they cannot prevent.
At least, these were my thoughts prior to reading more deeply into some of the arguments presented by those who oppose the use of aborted fetal tissues. After having delved a bit more into the arguments, I’ve changed my thinking. It think it is more reasonable to avoid the medical use of aborted fetal tissues.