I think we need to argue against abortion on the grounds of equal protection under the law. I would begin with the right to life of the human in the womb, but to reach the legalists I would say the law does not grant equal protection. When a woman wants an abortion because she's not ready to be a mom, she can abort even when the father says he's ready to be a dad. When a man wants the woman to have an abortion because he's not ready to be a dad, he cannot legally force her to get an abortion. Moreover, he is required to pay child support, even when he didn't want a child.