Is it just me or is Blair's logic incomplete?

Lack of empathy is a diagnostic criterion for psychopathy (Hare, 1991), and Blair shows that psychopaths also suffer from a profound deficit in moral competence. In particular, they do not draw a distinction between moral rules (e.g., don’t hit people) and conventional rules (e.g., rules about what clothing to wear in school). Blair concludes that psychopaths’ failure to draw this distinction indicates that they do not comprehend the essence of moral rules. When they say that something is “morally wrong,” they don’t really understand what these words mean. Blair speculates that this failure is a direct result of the empathy deficit.

Some gems for behavioural mechanism designers:

Studies using economic games have shown that, when angry, people are even willing to pay significant costs to punish those who fail to cooperate (Fehr and Gächter, 2002)16.

For example, Weyant (1978)14 found that people who are made to feel good by being given an easy test to solve are almost twice as likely, when compared to neutral controls, to volunteer for a charity that requires going door to door collecting donation