Where it is in his own interest, every organism may reasonably be expected to aid his fellows. Where he has no alternative, he submits to the yoke of communal servitude. Yet given a full chance to act in his own interest, nothing but expediency will restrain him from brutalizing, from maiming, from murdering his brother, his mate, his parent, or his child. Scratch an 'altruist' and watch a 'hypocrite' bleed.