Samaritrophobia, he read, is the suppression of an overactive conscience by the rest of the mind. 'You must all take instruction from me!' the conscience shrieks, in effect, to all the other mental processes. The other processes try it for a while, note that the conscience is unappeased, that it continues to shriek, and they note, too, that the outside world has not been even microscopically improved by the unselfish acts the conscience has demanded.
They rebel at last. They pitch the tyrannous conscience down an oubliette, weld shut the manhole cover of that dark dungeon. They can hear the conscience no more. In the sweet silence, the mental processes look about for a new leader, and the leader most prompt to appear whenever the conscience is stilled, Enlightened Self-interest, does appear. Enlightened Self-interest gives them a flag, which they adore on sight. It is essentially the black and white Jolly Roger, with these words written beneath the skull and crossbones, 'The hell with you, Jack. I've got mine!'
[God Bless You, Mr Rosewater, Vonnegut, K.]