First of all, 99% of the time, no babies are killed during abortion. Most abortions are carried out when the fetus is just a non-sentient fetus. The few times when they happen during late-term pregnancies is to preserve the mother's life, or when the baby won't survive childbirth.
There are, however, loads of instances in which anti-abortionists have directly and indirectly killed actual people. There was that tragedy with Savita Halappanavar, who was refused abortion, and died as a result of a miscarriage: [link]
There have also been many accounts of anti-abortionists first-degree murdering/injuring doctors and bombing clinics/hospitals (just naming some examples): [link][link][link][link][link][link][link][link][link]
In addition, any attempt to illegalize abortions will just result in making abortions unsafe. Unsafe abortions kill 70,000 women a year. On top of that, an average of 300,000 women die from childbirth each year.
No one who values life would support any of this.