It seems to me that the argument we are looking at can establish at most that there are some cases in which the unborn person has a right to the use of its mother's body, and therefore some cases in which abortion is unjust killing. There is room for much discussion and argument as to precisely which, if any. But I think we should sidestep this issue and leave it open, for at any rate the argument certainly does not establish that all abortion is unjust killing.