 What, then, is the psychological explanation for the widespread equation of altruism with morality? Rand suggests various explanations reminiscent of Nietzsche’s analysis of the psychology of altruism. The theorists and preachers of altruism are motivated largely by a desire to control and manipulate others by playing on their guilt. Those who accept their teachings typically do so either because of guilt over their own superior achievements, or because, lacking any “intellectual integrity, love of truth…or a passionate dedication to an idea”, they have nothing much worth saving, and so do not mind sacrificing themselves (“Selfishness Without a Self”, 1973b; 1982a). Some altruists are altruists because their mentalities are still frozen in a tribal past when survival required the sacrifice of some for the sake of others (1973b). Rand herself rejects a zero-sum picture of human relationships, so long as everyone in the relationship acts rationally.