Any time you masturbate, use contraceptives, don't have a baby when you're on your period, etc. you're stopping a potential human life from being formed. Do we feel guilty for that? No. It's just some nasty shit that we wash off =P. It really depends on your definition of when a zygote, cells, or fetus is a baby. At some point in time there's a state of being nasty shit and at another point it's a human. Everyone's definition varies (or point where it's nasty shit/human) so that's why it should be pro-choice. Partial birth abortions should be banned though imo. It's definitely murder.