Game theorists assume that rational defensibility is a necessary condition for moral, social, or political justification. By itself, this is a fairly uncontroversial claim; most moral or political philosophers would agree. And yet game theorists tend to be advocates of the free market. External critics of game theory usually claim this is because game theorists assume that individuals are atomistic and self-interested. Game theorists themselves deny this, however, for what strike us as good reasons. In principle, game theory has no (...) necessary ties to right-wing distribution schemes. Why, then, is game theory almost exclusively the province of conservative philosophers, political scientists, and economists? The problem, we believe, lies in the theory of rational choice standardly employed by game theory. Even if we accept, for the purposes of argument, game theory's account of the justification of moral dispositions — that a disposition is morally justified if and only if, in its absence, it would be game theoretically rational to acquire it — we need not be led to right-wing solutions. If we expand the kinds of choices facing individuals to include choices about what we will call ‘institutional roles,’ then we can explain the game theoretic rationality of the kinds of emotions and behavior exemplified by duty, loyalty, and love. (shrink)