The doctrine of the moral equality of combatants holds that combatants on either side of a war have equal moral status, even if one side is fighting a just war while the other is not. This chapter examines arguments that have been offered for and against this doctrine, including the collectivist position famously articulated by Walzer and McMahan’s influential individualist critique. We also explore collectivist positions that have rejected the moral equality doctrine and arguments that some individualists have offered in (...) its favor. We defend a non-categorical version of the moral equality doctrine, according to which combatants on either side of a just war sometimes (but not always) have equal moral status. On our view, some degree of culpability is necessary for liability, and non-culpable combatants may therefore sometimes remain non-liable even when they fight for an unjust cause. (shrink)

May lethal autonomous weapons systems—‘killer robots ’—be used in war? The majority of writers argue against their use, and those who have argued in favour have done so on a consequentialist basis. We defend the moral permissibility of killer robots, but on the basis of the non-aggregative structure of right assumed by Just War theory. This is necessary because the most important argument against killer robots, the responsibility trilemma proposed by Rob Sparrow, makes the same assumptions. We show that the (...) crucial moral question is not one of responsibility. Rather, it is whether the technology can satisfy the requirements of fairness in the re-distribution of risk. Not only is this possible in principle, but some killer robots will actually satisfy these requirements. An implication of our argument is that there is a public responsibility to regulate killer robots ’ design and manufacture. (shrink)

Traditional just war theory maintains that the two types of rules that govern justice in times of war, jus ad bellum (justice of war) and jus in bello (justice in war), are logically independent of one another. Call this the independence thesis. According to this thesis, a war that satisfies the ad bellum rules does not guarantee that the in bello rules will be satisfied; and a war that violates the ad bellum rules does not guarantee that the in bello (...) rules will be violated. A controversial implication of this is that it’s possible for soldiers to undergo acts that are instrumental in bringing about victory in an unjust war and yet do nothing morally wrong. Some authors – call them purists – claim that this cannot be correct. Participating in an unjust war is by itself morally wrong. Yitzhak Benbaji has given what is to my mind the strongest defense of the independence thesis. In this paper I critically examine Benbaji’s argument and conclude that it is not persuasive. My argument against Benbaji incorporates the concept of honor in the military. I seek to show, in part, that if the recent literature is correct concerning both the nature of honor and the importance of instilling it in soldiers, then Benbaji hasn’t given the purist a compelling reason to give up her view. (shrink)

According to a widespread view, the same constraints that limit the use of otherwise immoral measures in individual self-defense apply to collective self-defense too. I try to show that this view has radical implications at the level of jus in bello, implications which have not been fully appreciated. In particular, if the necessity condition must be satisfied in all cases of killing in war, then most fighting would turn out to be unjust. One way to avoid this result is to (...) adopt a contractualist view of killing in war, a view which interprets the necessity condition in a way that is more permissive with regard to killing combatants in war. At least in this respect, a contractualist view of killing in war has an advantage over other candidates in explaining how wars might be fought justly. (shrink)

Most philosophers writing on the ethics of war endorse “reductivist individualism,” a view that holds both that killing in war is subject to the very same principles of ordinary morality ; and that morality concerns individuals and their rights, and does not treat collectives as having any special status. I argue that this commitment to individualism poses problems for this view in the case of national defense. More specifically, I argue that the main strategies for defending individualist approaches to national (...) defense either fail by their own lights or yield deeply counterintuitive implications. I then offer the foundations for a collectivist approach. I argue that such an approach must do justice to the collective goods that properly constituted states make possible and protect through certain acts of defensive war; and that any such picture of national defense must make room for some form of national partiality. (shrink)

Combatants who attempt to obey the laws of war often have to take considerable risks in order to effectively discriminate between legitimate and illegitimate targets. Sometimes this task is made even more complicated by systemic factors which influence their ability to discriminate effectively without unduly risking their lives or the mission. If they fail to do so, civilians often pay the price. In this paper, I argue that to the extent that non-combatants benefit from the attempt to fight justly, and (...) to the extent that wars in which combatants attempt to fight justly can be understood as a system of social cooperation which produces both burdens and benefits, non-combatants have a responsibility to shoulder their fair share of these burdens. Thus, if combatants (and by extension enemy non-combatants) are disproportionately burdened in a conflict, non-combatants ought to take on some costs, for instance in order to reduce the strain imposed on combatants by systemic factors such as the availability and distribution of resources. (shrink)

In recent decades, revisionist philosophers have radically challenged the orthodox just war theory championed by Michael Walzer in the 1970s. This review considers two new contributions to the debate, Benbaji and Statman’s War by Agreement and Ripstein’s Kant and the Law of War, which aim to defend the traditional war convention against the revisionist attack. The review investigates the two books’ respective contractarian and Kantian foundations for the war convention, their contrast with the revisionist challenge, and their points of disagreement. (...) Building on the responses to Ripstein in the edited collection, The Public Uses of Coercion and Force, and providing an overview of the broader debate, the review offers an analysis of the two books’ positions on the relationship between the morality and laws of war, on just cause and the crime of aggression, and on the equality between just and unjust combatants. (shrink)

Combatants who attempt to obey the laws of war often have to take considerable risks in order to effectively discriminate between legitimate and illegitimate targets. Sometimes this task is made even more complicated by systemic factors which influence their ability to discriminate effectively without unduly risking their lives or the mission. If they fail to do so, civilians often pay the price. In this paper, I argue that to the extent that non-combatants benefit from the attempt to fight justly, and (...) to the extent that wars in which combatants attempt to fight justly can be understood as a system of social cooperation which produces both burdens and benefits, non-combatants have a responsibility to shoulder their fair share of these burdens. Thus, if combatants (and by extension enemy non-combatants) are disproportionately burdened in a conflict, non-combatants ought to take on some costs, for instance in order to reduce the strain imposed on combatants by systemic factors such as the availability and distribution of resources. (shrink)

This paper surveys the most important recent debates within the ethics of war. Sections 2 and 3 examine the principles governing the resort to war (jus ad bellum) and the principles governing conduct in war (jus in bello). In Section 4, we turn to the moral guidelines governing the ending and aftermath of war (jus post bellum). Finally, in Section 5 we look at recent debates on whether the jus ad bellum and the jus in bello can be evaluated independently (...) of each other. (shrink)

Cosmopolitan War is characterized by a tension between moral demandingness and moral permissiveness. On the one hand, Fabre is strongly committed to the value of each and all human beings as precious individuals whose value does not depend on their national or other affiliation. This commitment leads to serious constraints on what may be done to others in both individual and national self-defense. Yet the book is also unambiguously permissive. It opens the gate to far more wars than traditional just (...) war theory would ever permit, in particular to what Fabre has dubbed ‘subsistence wars’, and it rejects the most fundamental constraint imposed by traditional jus in bello, namely, the prohibition against the deliberate killing of civilians. While both the demanding and the permissive aspects of the book seem troublesome to me, the latter seem more so and most of my paper is devoted to a critical examination of them. In the last part of the paper, I point to a different outlook to the one defended in the book and try to show that this outlook is less foreign to Fabre’s outlook than one might expect. (shrink)

In light of the enormous suffering brought about by war, war might be justified only if the benefit it yields is significant enough, namely, a clear and durable victory over the enemy. The logic of this argument leads to a Clausewitz-style war of “annihilation.” I argue that the best way to justify the ending of war short of such annihilation is by relying on a contractarian view of jus ex bello. I conclude by exploring the implications of this view to (...) warfare in which no effective social contract is in place. (shrink)