 Philosophical discussions of respect since Kant have tended, on the one hand, to develop or apply various aspects of it, or on the other, to take issue with it or develop alternative accounts of respect. Some of the discussions have focused on more theoretical issues. For example, Kant gives the notion of respect for persons a central and vital role in moral theory. One issue that has since concerned philosophers is whether respect for persons is the definitive focus of morality, either in the sense that moral rightness and goodness and hence all specific moral duties, rights, and virtues are explainable in terms of respect or in the sense that the supreme moral principle from which all other principles are derived is a principle of respect for persons. Some philosophers have developed ethical theories in which a principle of respect for persons is identified as the fundamental and comprehensive moral requirement (for example, Donagan 1977; Downie and Telfer 1969). Others (for example, Hill 1993; Frankena 1986; Cranor 1975) argue that while respect for persons is surely a very important moral consideration, it cannot be the principle from which the rest of morality is deduced. They maintain that there are moral contexts in which respect for persons is not an issue and that there are other dimensions of our moral relations with others that seem not to reduce to respect. Moreover, they argue, such a principle would seem not to provide moral grounds for believing that we ought to treat mentally incapacitated humans or nonhuman animals decently, or would (as Kant argues) make a duty to respect such beings only an indirect duty—one we have only because it is a way of respecting persons who value such beings or because our duty to respect ourselves requires that we not engage in activities that would dull our ability to treat persons decently—rather than a direct duty to such beings (Metaphysics of Morals, 6:443).