1) is the killing of an innocent human being wrong?
2) is it a certainty that the fetus is not a human being?
3) if it is possible that the fetus is a human being, is there not an absolute moral imperative to assume that it is a life?
4) if you were instilled with metaphysical certitude that a fetus was human, would you be compelled to oppose abortion?
5) if there is a possibility that the fetus is a human being, given the consequences of such an error in assuming that it is not, should you be compelled to oppose abortion? i.e. of the should you err on the side of the side of protecting the fetus?