 Kitcher (2006a,b; 2011) has proposed a three-stage account of the evolution of morality. It begins with the evolution of an early but fragile form of psychological altruism among hominins in the context of “coalition games” in mixed adult groups. The social structure would have been similar to that of contemporary chimpanzees and bonobos, where cooperation among the relatively weak (or those in weak stages of life) is beneficial to them, but strategic calculation is infeasible. These conditions may have led from simpler forms of biological altruism developed through kin selection to the evolution of a psychological altruistic disposition involving “a blind tendency to respond to the preferences of another animal with whom you might engage in cooperative activity,” as a simple but effective mechanism for promoting advantageous participation in coalitions and subcoalitions (Kitcher 2006b). (This is the ‘indiscriminate’ altruism discussed in the previous sub-section.)