Jesus was serious about the Kingdom bringing a righteousness back into play that would exceed the righteousness of the Pharisees. The goal of a true pro-life ethic in the Kingdom of God should be to move away from the emphasis on the regulations of the Law and return to the character of the Law.
The Kingdom ethic demands more of us. A true pro-life ethic may require more out of us, but we have more power available to walk in that ethic. The Kingdom power is at our disposal.