Hamilton’s rule, rB>C, was good for the family or at most, after George’s
correction, to those who shared similar genes. But what about altruism between
nongenetically related organisms? This, after all, had been the moralist’s concern
throughout the ages, sacrifice among relations being a lesser riddle to spin.
Recognizing the problem, the Judeo-Christian tradition exhorted its followers to
“Love thy neighbor as thyself,” but Aristotle was more of a cynic. “The friendly
feelings that we bear for another,” he wrote in his Nichomachean Ethics, “have
arisen from the friendly feelings that we bear for ourselves.”
33
Pagan thought was not the only hardened philosophy on the moralism block:
Saint Thomas Aquinas took a surprisingly utilitarian position, arguing in the
Summa Theologia that we should love ourselves more than our neighbors. His
interpretation of the Pauline phrase was that we should seek the common good
more than the private good since the common good is a more desirable good for
the individual. David Hume, in A Treatise of Human Nature, may have spelled
out at the age of twenty-six what the venerable medieval theologian was thinking:
“I learn to do service to another, without bearing him any real kindness: because I
foresee, that he will return my service, in expectation of another of the same kind,
and in order to maintain the same correspondence of good offices with me or
others.”
34
In 1776, the year of Hume’s death, his Edinburgh neighbor the economist Adam
Smith put it even more directly in The Wealth of Nations: “It is not from the
benevolence of the butcher, the brewer, or the baker, that we expect our dinner,
but from their regard to their own interest. We address ourselves not to their
humanity but to their self-love, and never talk to them of our own necessities but
of their advantages. Nobody but the beggar chooses to depend chiefly on the
benevolence of his fellow citizens.” Most succinct of all, however, was the
Dutch-born English satirist Bernard de Mandeville, who in a couplet from 1714
wrote: “Thus every Part was full of Vice, / Yet the whole Mass a Paradise.”
35
And so when a precocious son of Lithuanian Jewish immigrants started his
education at Harvard in the early 1960s, he had quite a philosophical tradition to
build on. But Robert Trivers was not interested in biology—he wanted to be a
lawyer—and it would take a breakdown (his mania took the form of staying up all
night, night after night, reading Wittgenstein and finally collapsing) to bring him
closer to the animal world. Diagnosed with schizophrenia, Trivers took an
illustrating course while recovering, and was hired to draw animals for a biology
textbook. His mentor was Bill Drury, an Audubon ornithologist whom he learned
to love and revere. “Bill and I were walking in the woods one day,” Trivers once
recounted to a reporter, “and I told him that my first breakdown had been so
painful that I had resolved that if I ever felt another one coming on, I would kill
myself. Lately, however, I had changed my mind, and drawn up a list of 10 people
I would kill first in that event. I wanted to know if this was going forwards or
backwards. He thought for a while, then he said ‘Can I add three names to that