No matter what people say, I believe that the concept ofmorality is merely constructed by humans. I mean, non-mammalian organisms haveonly the drive to survive and are completely amoral. Mammals, however, have alimbic system which governs emotion. I hypothesize that good and evil arosefrom the pleasure principle: what makes us feel better is good and what makesus feel worse is bad. Then there is the societal aspect of things, where somesacrifices are made (we can’t always have instant gratification) for thegreater good of the community.
We’re still controlled by our selfish impulses. It’s just they’vebeen redirected in ways that support mutualism so that it seems like we’re beingnice, and we are, in a way. But doing good? Furthers our own needs.