Christian Apologies for Roe-Wade - Tim Keller and Hatmaker

Well-known evangelical writer Jen Hatmaker argues in favor of abortion, while the extremely influential evangelical pastor Tim Keller presents his case for the legalization of abortion. Keller's argument in a nutshell: "If we refuse to ban idolatry, we must be open to continued legalized abortion as at least a legitimate Christian posture." What's wrong with the line of thinking? Would you recommend Keller's worldview?