[MD] example of reciprocal altruism?

[craigerb at comcast.net]

[Platt]
> A couple of monkeys behaving with reciprocity in a zoo is hardly evidence 
> of our inheriting a spirit (sic) of cooperation from our animal ancestors.

[Pirsig
"intellectual faith in man's basic goodness as spontaneous and natural is 
disastrously naive...maybe it is man's basic goodness which 
invented social institutions to repress this land of biological savagery in 
the first place." (Lila, 24)

Pirsig's point is that evolution is not limited to biology.  Humans are evolving
with their social instituions.
Craig