The loss of one’s life is one of the greatest losses one can suffer. The loss of one’s life deprives one of all the experiences, activities, projects, and enjoyments that would otherwise have constituted one’s future. Therefore, killing someone is wrong, primarily because the killing inflicts (one of) the greatest possible losses on the victim. To describe this as the loss of life can be misleading, however. The change in my biological state does not by itself make killing me wrong. The effect of the loss of my biological life is the loss to me of all those activities, projects, experiences, and enjoyments which would otherwise have constituted my future personal life. These activities, projects, experiences, and enjoyments are either valuable for their own sakes or are means to something else that is valuable for its own sake. Some parts of my future are not valued by me now, but will come to be valued by me as I grow older and as my values and capacities change. When I am killed, I am deprived both of what I now value which would have been part of my future personal life, but also what I would come to value. Therefore, when I die, I am deprived of all of the value of my future. Inflicting this loss on me is ultimately what makes killing me wrong. This being the case, it would seem that what makes killing any adult human being prima facie seriously wrong is the loss of his or her future.6
How should this rudimentary theory of the wrongness of killing be evaluated? It cannot be faulted for deriving an ‘ought’ from an ‘is’, for it does not. The analysis assumes that killing me (or you, reader) is prima facie seriously wrong. The point of the analysis is to establish which natural property ultimately explains the wrongness of the killing, given that it is wrong. A natural property will ultimately explain the wrongness of killing, only if (1) the explanation fits with our intuitions about the matter and (2) there is no other natural property that provides the basis for a better explanation of the wrongness of killing. This analysis rests on the intuition that what makes killing a particular human or animal wrong is what it does to that particular human or animal. What makes killing wrong is some natural effect or other of the killing. Some would deny this. For instance, a divine‐command theorist in ethics would deny it. Surely this denial is, however, one of those features of divine‐command theory which renders it so implausible.
The claim that what makes killing wrong is the loss of the victim’s future is directly supported by two considerations. In the first place, this theory explains why we regard killing as one of the worst of crimes. Killing is especially wrong, because it deprives the victim of more than perhaps any other crime. In the second place, people with AIDS or cancer who know they are dying believe, of course, that dying is a very bad thing for them. They believe that the loss of a future to them that they would otherwise have experienced is what makes their premature death a very bad thing for them. A better theory of the wrongness of killing would require a different natural property associated with killing which better fits with the attitudes of the dying. What could it be?
The view that what makes killing wrong is the loss to the victim of the value of the victim’s future gains additional support when some of its implications are examined. In the first place, it is incompatible with the view that it is wrong to kill only beings who are biologically human. It is possible that there exists a different species from another planet whose members have a future like ours. Since having a future like that is what makes killing someone wrong, this theory entails that it would be wrong to kill members of such a species. Hence, this theory is opposed to the claim that only life that is biologically human has great moral worth, a claim which many anti‐abortionists have seemed to adopt. This opposition, which this theory has in common with personhood theories, seems to be a merit of the theory.
In the second place, the claim that the loss of one’s future is the wrong‐making feature of one’s being killed entails the possibility that the futures of some actual nonhuman mammals on our own planet are sufficiently like ours that it is seriously wrong to kill them also. Whether some animals do have the same right to life as human beings depends on adding to the account of the wrongness of killing some additional account of just what it is about my future or the futures of other adult human beings which makes it wrong to kill us. No such additional account will be offered in this essay. Undoubtedly, the provision of such an account would be a very difficult matter. Undoubtedly, any such account would be quite controversial. Hence, it surely should not reflect badly on this sketch of an elementary theory of the wrongness of killing that it is indeterminate with respect to some very difficult issues regarding animal rights.
In the third place, the claim that the loss of one’s future is the wrong‐making feature of one’s being killed does not entail, as sanctity of human life theories do, that active euthanasia is wrong. Persons who are severely and incurably ill, who face a future of pain and despair, and who wish to die will not have suffered a loss if they are killed. It is, strictly speaking, the value of a human’s future which makes killing wrong in this theory. This being so, killing does not necessarily wrong some persons who are sick and dying. Of course, there may be other reasons for a prohibition of active euthanasia, but that is another matter. Sanctity‐of‐human‐life theories seem to hold that active euthanasia is seriously wrong even in an individual case where there seems to be good reason for it independently of public policy considerations. This consequence is most implausible, and it is a plus for the claim that the loss of a future of value is what makes killing wrong that it does not share this consequence.
In the fourth place, the account of the wrongness of killing defended in this essay does straight‐forwardly entail that it is prima facie seriously wrong to kill children and infants, for we do presume that they have futures of value. Since we do believe that it is wrong to kill defenseless little babies, it is important that a theory of the wrongness of killing easily account for this. Personhood theories of the wrongness of killing, on the other hand, cannot straightforwardly account for the wrongness of killing infants and young children.7 Hence, such theories must add special ad hoc accounts of the wrongness of killing the young. The plausibility of such ad hoc theories seems to be a function of how desperately one wants such theories to work. The claim that the primary wrong‐making feature of a killing is the loss to the victim of the value of its future accounts for the wrongness of killing young children and infants directly; it makes the wrongness of such acts as obvious as we actually think it is. This is a further merit of this theory. Accordingly, it seems that this value of a future‐like‐ours theory of the wrongness of killing shares strengths of both sanctity‐of‐life and personhood accounts while avoiding weaknesses of both. In addition, it meshes with a central intuition concerning what makes killing wrong.
The claim that the primary wrong‐making feature of a killing is the loss to the victim of the value of its future has obvious consequences for the ethics of abortion. The future of a standard fetus includes a set of experiences, projects, activities, and such which are identical with the futures of adult human beings and are identical with the futures of young children. Since the reason that is sufficient to explain why it is wrong to kill human beings after the time of birth is a reason that also applies to fetuses, it follows that abortion is prima facie seriously morally wrong.
This argument does not rely on the invalid inference that, since it is wrong to kill persons, it is wrong to kill potential persons also. The category that is morally central to this analysis is the category of having a valuable future like ours; it is not the category of personhood. The argument to the conclusion that abortion is prima facie seriously morally wrong proceeded independently of the notion of person or potential person or any equivalent. Someone may wish to start with this analysis in terms of the value of a human future, conclude that abortion is, except perhaps in rare circumstances, seriously morally wrong, infer that fetuses have the right to life, and then call fetuses “persons” as a result of their having the right to life. Clearly, in this case, the category of person is being used to state the conclusion of the analysis rather than to generate the argument of the analysis.
The structure of this anti‐abortion argument can be both illuminated and defended by comparing it to what appears to be the best argument for the wrongness of the wanton infliction of pain on animals. This latter argument is based on the assumption that it is prima facie wrong to inflict pain