That's a straw an argument.
There are rarely medical emergencies in pregnancy that require aborting a baby (ectopic pregnancies come to mind) but that is not Tiller was doing. Please state exactly what "documented cases" require an abortion of a baby in the 2nd and 3rd trimesters that Tiller performed. There aren't any. Those babies could've have been delivered by c section and cared for in the neonatal intensive care units. Babies as young as 22 weeks are surviving now.
By the way, back in the sixties, my father was told to choose between my mother and me. He told the doctors "Both". We are both here today and you mean to tell me that medical science has not advanced enough to make your "emergency abortions" a thing of the past?