That 30% of abortions are for women who already have children and who have decided that an additional child is not right for their family. These are people who have both thought about the issue in advance and have a good working knowledge of how pregnancy works and yet, with the exception of those who get unlucky, have also made the conscious decision not to use contraception.
I am unsure why you are objecting so strongly to the concept, Ora. If women genuinely believe that the early stage life inside them is in no meaningful sense human then aborting it as a failsafe measure if, say, the timing method was to fail, or they were simply caught without contraception and decided to risk it, would not be a controversial or traumatic decision.