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fact an intentional human activity about which it is possible to make choices. If choices are possible, then the realist argument fails, and space for consideration of justice opens up. If action in war is not inevitable but is in some respects chosen, then realists cannot claim that states necessarily act only with regard to considerations of power or national security.

      Walzer concludes that moral discourse about war is rather more similar to military strategy than we usually think. Each can be abused for nefarious purposes, but they share a common referent that is broadly understood by combatants (13–16). In both cases, the rules are often honored in the breach: just as just-war theorists know that ethical principles are often violated, so too must strategists be aware of the ubiquity of “confusion and disorder in the field” (14). However, given that, on Walzer’s argument, participants have at least some scope for making free choices, they must be perceived as people responsible for their actions, not as either victims or instruments. Moreover, Walzer argues, when we study the history of war, we see that we do in fact hold participants responsible for their actions. We have built up over time a “moral reality of war” (15); that is, a “set of articulated norms, customs, professional codes, legal precepts, religious and philosophical principles, and reciprocal arrangements” (44). Walzer grounds his just-war theory in this set of informal conventions created over time by human participants in military conflict, and calls it the “war convention” (127–221).

      Walzer considers the version of realism that attempts to describe the behavior of states in the anarchic international system, but it is important to note that his critique simply does not address all versions of realism. There is also a “prescriptive realism” that stipulates that states ought to act out of concern for national survival, because any attempt to wage just wars will increase military destructiveness by encouraging secularized crusades (for discussion, Orend 2000: 66–8, 2013: 257–68). On the prescriptive realist view, an amoral policy motivated by national security is the best that we can hope for in a world marked by moral disagreement and because just-war theorists “fill people’s head with talk of aggression” (Orend 2013: 258; for a similar argument, Calhoun 2001). Indeed, realism is not by any means always a militaristic doctrine. Hans Morgenthau, one of the major realists of the 1960s, joined Walzer in opposition to Vietnam, largely because of concern that the USA would overstretch itself (for discussion, Rafshoon 2001, Zambernardi 2011). He and Walzer even co-authored an article in Dissent on American responsibility for the Khmer Rouge regime in Cambodia (Chomsky, Morgenthau, and Walzer 1978).

      The most significant feature of Walzer’s critique of realism is what it tells us about the bases and method of his just-war theory. It is because moral judgments are shared across cultures and epochs that moral arguments about war are mutually comprehensible and just-war theorizing possible. So, although Walzer starts Wars by stating that he will not appeal to moral foundations, or “expound morality from the ground up,” but simply assume universal rights to life and liberty (Walzer 2015a: xxvi), the critique of realism reveals that the theory has a foundation. It is an interpretation of the discourse about war developed over centuries of military history. What Walzer means when he says that he will not consider the foundations of morality is that he will not seek to establish his premises in logical or abstract argumentation. Rather, he assumes that the tools needed for military ethics are immanent in the world and that, starting with a set of conventional understandings, it is possible to develop a coherent theory that is, often, critical of practice. This occurs by systematizing principles and juxtaposing them both to each other and to military events. That is, the moral reality of war does not consist of shared conclusions but of shared language and problems (xxviii). Walzer’s just-war theory uses conventional understandings as its starting point but seeks to reform them by exposing their incompatibility with other deeply held commitments. The method is at once interpretive and critical.

      Orend notes that Walzer does not attempt to address recent philosophical pacifism (Orend 2000: 70–2). While much of this work postdates Wars, Walzer does not devote sustained attention to it in any of his subsequent just-war theorizing.4 The challenge is that, like Walzer, pacifists point to conventional ideals, but suggest that, when properly understood, they point toward outright rejection

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