ABSTRACT
An attacker who threatens the lives of several innocents can, and sometimes does, forfeit his right to life. This chapter argues that the same is true for fetuses. It also argues that, assuming fetuses have rights, unwanted fetuses are unjust bodily invaders and thus forfeit their right to life. It further argues that abortion is morally permissible because pregnant women do not fail to satisfy the duty to save. Abortion is a killing. If it is a killing, then it is just only if it is proportionate to a threat. The chapter also argues that abortion is just because it does not infringe on anyone's right. It's claim rests on three assumptions. First, the fetus has no right to be inside the woman. Second, if the fetus has no right to be inside the woman, then it may be removed with proportionate force. Third, in abortion, the woman uses proportionate force.
