 According to the M’Naughten rules for criminal insanity, a person is legally insane if, due to a disease of the mind at the time of acting, she is unable to know the nature or quality of her action or to know that what she is doing is wrong. For instance, a delusional schizophrenic who believes that her neighbour is a demon is not responsible for harming her neighbour since she does not understand that she is harming an innocent person; she believes she is defending herself from an inhuman malicious agent. Many philosophers believe that the M’Naughten rules give us the conditions for moral responsibility as well as the conditions for criminal responsibility (see, e.g., Wolf 1987).