Brain dead people have a medical condition whether it be from a stroke or injury, a baby has nothing wrong with it other than a mother who does not care whether he or she lives or dies.*
You right, sex makes kids. Abortion kills kids.
You say that the fetus doesn't know or cannot feel pain and that may be true but you are still ending a life that if left alone most likely will be born healthy, grow and become just like you and me.
But because the mother chooses to end this individuals life and any future he or she may have, to me it is so clear how horribly wrong this is.