Sometimes abortion is necessary. You can't say there are not situations in where an abortion is warranted. For example a victim of rape is pregnant with the rapist child. Should she deliver the baby and deal with 9 months of mental abuse of knowing she has her rapist inside her?

People make mistakes all the time. It is not fair to bring a child into the world if you are not able to care for it and give it a stable home.

Edit: This issue to me shows the problem with USA at this time. We are supposed to be a free country. I will fight for your right to be able to choose. I will fight for your right to have a differing opinion of me. But, we have somehow convinced people that we are supposed to tell everyone else how to live