I think we have to try and look at things from the other side, too. If we have anti-abortion laws, we therefore have forced birth. Why is it okay to force a woman to carry and birth a child that she does not want? How will that child be treated by the parent/s if it is not wanted? Will it suffer? Will it create even more strain on the departments of children's services? It's all very well and good to suggest that the baby be put up for adoption, but there's still problems with this. You are still forcing a woman to be pregnant and to give birth against her will, and adoption is not an easy process, it can be long and hard. Do we want to place more children in the system?
Look, as I've stated already, I'm okay with laws that govern over abortions (doctors signing off, ethics committees, no abortions for superficial reasons such as eye/hair colour), I have the be okay with it, we are NEVER going to be in a position where an abortion is granted past a certain gestation for reasons such as eye colour. But we absolutely must allow abortions "just because" up to a certain point (and I believe it's as late as 24 weeks as generally, up to this point the unborn is incompatible with life), after that point, there are restrictions in place. They may be medical on the grounds of the health of the unborn, or the physical OR mental health of the woman.
I'm not really sure what more people want? We absolutely cannot have complete anti-abortion laws. They're dangerous, for a myriad of reasons, so we have abortion laws with restrictions and conditions.