Read about the history of abortion.
If prostitution is the oldest profession, then performing abortions for those women is probably the second oldest.
Its easy for a conservative middle aged, middle classed man to tell a young woman how she should live her life. Now imagine if you were that young woman of 16 or 17 with that decision weighing on you because you made a bad choice. I would guess that a lot of those middle aged men have daughters that have had abortions and they probably arent even aware of it.
Dont get me wrong, Im extremely uncomfortable with the idea of abortion but I havent walked in the shoes of someone that has had to make that decision.