You are right, thats what makes it so difficult, but think of it this way, yes the child has no say, but like i had said, i wouldnt want to be forced into being given birth to, if for the reason that she couldnt afford a child or she wouldnt want to put another child up for adoption. And say the child was born, they could be born into some screwed up situations, abusive parents, poverty, etc.
Like i said, abortion is not a happy situation, liberals and democrats dont enjoy the thought of abortion, but its just an option. Also think of the fact that, would you want people who consider aborting their child being parents? saying that you would rather a parent to be forced into having a child they dont want may the the more moral route, but it doesnt mean its good for the child.