@maxdancona,
It's not so much that there are valid points on both sides; it's that this is a perennial issue that's been going on since the beginning of human history. There is tension between supporting life and controlling it so it doesn't get out of hand. There are negative pressures against population growth, migration, etc. and birth-control plus abortion is how some people want to deal with those pressures. Others want to give everyone a shot at life, and they want abstinence, the traditional method for avoiding pregnancy, to gain ground.
The problem is what other methods of controlling life will gain ground if abortion is illegal but people still don't abstain to prevent pregnancies? Will population growth accelerate, and if so how will we deal with growing numbers of people? Can we accommodate them economically? Can we reach a point where population growth is self-regulating without abortions taking place? Is that even possible?