It has saved countless lives. Sorry, but the adult woman's life is far more important than the fetus. Now, I'm not a fan of abortion, but I also think it's none of my business. Before the legalization of abortion, women would go to doctors who provided them in secret, often in non-sterile environments, and without the proper attention from nurses and other medical workers. Many, many women died of infection, blood loss, botched surgery, or just incorrect knowledge from the doctor. They were even provided by people with no medical knowledge at all -- remember the infamous image of the coat-hanger in the alley. Women who want abortions are going to get them, and I'd rather they be provided safely and legally rather than secretly and dangerously.
(Just food for thought; in Jewish law, if a woman has complications in pregnancy or delivery, the attending doctors are obligated to save the woman first, even if that means letting the baby die.)