So that 'one by one' response boils down to repeating several times your opposition to abortion at all. Got it. Fortunately, people are not forced to abide by your opinions. I take the point of view that a functioning human life requires an active human brain; we accept brain death as a distinction of the end of life, so the inauguration of brain activity can be taken as the beginning of a human life. Until there are alpha waves (or some other test for ongoing neural activity), I consider a fetus a potential life, but not an actualized one. This happens to take place around the end of the second trimester. There has to be some point at which there was not an independent life before and now there is one. Some people put this at conception, which means that birth control pills are a form of active murder, since they prevent fertilized embryos from implanting in the lining of the womb. I put it at the start of consistent neural activity.