How is this fair??

A pregnant teen and her 19 y/o boyfriend killed their twin baby feti by punching and stepping on her stomach, after she asked him to help her. The boyfriend was sentenced to life in prison, while the woman cannot be prosecuted because of her legal right to abortion. What?? Something is wrong here. I want to know what you think about this. I don't know how the law works here. Obviously, I think they are both guilty of murder, but shouldn't all abortionists be punished as murderers like this 19 year old? Or is it just because you have a doctor's license you can kill babies? Just a messed up situation.