Abortion is largely accepted even for reasons that do not have anything to do with the fetus’ health. By showing that (1) both fetuses and newborns do not have the same moral status as actual persons, (2) the fact that both are potential persons is morally irrelevant and (3) adoption is not always in the best interest of actual people, the authors argue that what we call ‘after-birth abortion’ (killing a newborn) should be permissible in all the cases where abortion is, including cases where the newborn is not disabled.
It might be claimed that someone is harmed because she is prevented from becoming a person capable of appreciating her own being alive. Thus, for example, one might say that we would have been harmed if our mothers had chosen to have an abortion while they were pregnant with us or if they had killed us as soon as we were born. However, whereas you can benefit someone by bringing her into existence (if her life is worth living), it makes no sense to say that someone is harmed by being prevented from becoming an actual person. The reason is that, by virtue of our definition of the concept of ‘harm’ in the previous section, in order for a harm to occur, it is necessary that someone is in the condition of experiencing that harm.
If a potential person, like a fetus and a newborn, does not become an actual person, like you and us, then there is neither an actual nor a future person who can be harmed, which means that there is no harm at all. So, if you ask one of us if we would have been harmed, had our parents decided to kill us when we were fetuses or newborns, our answer is ‘no’, because they would have harmed someone who does not exist (the ‘us’ whom you are asking the question), which means no one. And if no one is harmed, then no harm occurred. [Emphasis added]