Here's an example of why it's important to recognize abortion as killing: a UK professor of bioethics
John Harris, a member of the Human Genetics Commission, told a meeting at Westminster he did not see any distinction between aborting a fully grown unborn baby at 40 weeks and killing a child after it had been born.
Harris, who is a professor of bioethics at Manchester University, would not be drawn on which defects or problems might be used as grounds for ending a baby’s life, or how old a child might be while it could still be destroyed.
Harris was reported to have said that he did not believe that killing a child was always inexcusable.
In addition, it was claimed that he did not believe that there was any ‘moral change’ that occurred between when the baby was in the womb and when it had been brought into the world.Well, we agree on that last point -- I just happen to think it's wrong to kill babies either before or after they're born, whereas he thinks it's ok to kill them any time.
Really though, why not kill defective adults as well? The only difficulty is defining "defective".
(As a side note, this is remarkably similar to the question of deciding who gets to vote.)