 It is controversial whether psychopaths are insane according to the standard set by the M’Naughten rules since it is controversial whether psychopaths know that their actions are wrong. Motivational internalists believe that it is conceptually impossible to believe (and thus to know) that an action is morally wrong and yet be completely unmotivated to refrain from performing the action. That is, for the internalist, there is a conceptual connection between believing that an action is wrong and having a con-attitude toward the action. The internalist believes that one may be able to knowingly do what is wrong because, all things considered, she cares more about something that is incompatible with refraining from wrongdoing, provided she is at least somewhat inclined to refrain from doing what she knows to be wrong. Since psychopaths seem to be completely indifferent to whether their actions are right or wrong, motivational internalists believe that they do not truly believe, or understand, that what they do is morally wrong. At most, they might believe that their harmful actions break societal conventions. But it may be one thing to believe that one has broken a societal convention and quite another to believe that one has broken a moral rule. Philosophers who reject the internalist thesis, i.e., motivational externalists, are more willing to believe that psychopaths know the difference between right and wrong. According to motivational externalists, moral knowledge only requires an intellectual capacity to identify right and wrong, and not the ability to care about morality. Since psychopaths are not intellectually deficient, motivational externalists do not think there is any reason to believe that psychopaths cannot tell the difference between right and wrong. (For more about how the internalist and externalist theses relate to the moral responsibility of psychopaths see Brink 1989, 45–50; Duff 1977; Haksar 1965; and Milo 1984. See also Rosati 2006. Recently, some theorists writing about the moral responsibility of psychopaths have tried to avoid the internalist/externalist debate. It is beyond the purview of this entry to survey this literature. See Levy 2007 and 2014, Matravers 2008, Talbert 2008, Aharoni, Kiehl, and Sinnott-Armstrong 2011, Nelkin 2015.)