My previous post on The Selfish Gene didn’t quite cram in all of the ideas I wanted to touch on. Or, more precisely, I didn’t articulate some of them very well (if at all). So let’s revisit them a bit more explicitly before moving on.
A common complaint against “survival of the fittest” is that on the surface it seems incompatible with altruistic behaviour. If the fittest really do survive, why do people ever make sacrifices for the greater good? Don’t those sacrifices make them less likely to survive, thus weeding out such behaviour over time? Should we not, if “survival of the fittest” were true, be seeing nearly perfectly selfish people, each aiming for their own survival at the expense of everyone else?
This is the primary complaint that Dawkins was answering in his book, and the title (though otherwise a bit misleading) does in some sense encapsulate his answer to those question. The key point to remember is that the basic unit of survival, the thing on which “survival of the fittest” actually operates, is not the individual animal. The things that are surviving according to their fitness are, in fact, our genes.
Since human beings share a substantial portion of genetic code simply by belonging to the same species, this view makes altruism much more coherent; we may sacrifice a bit of our own personal good, but if the increase in general good means many more people survive to reproduce, this is good for our genes overall (thus why Dawkins calls them “selfish”).
This also explains why we tend to be more altruistic towards close family: they share a larger percentage of our genes than some other random person.