There is a lot of fascinating scholarship going on in science and philosophy concerning how human morality relates to evolution. Scientists report altruistic behavior in animal communities, and high correlations between specific parts of the brain and moral action; philosophers explore the moral implications of human evolution; and both groups do much, much more. Still, the debate is ongoing about whether morality is an objective, universal, literally existing thing or a set of parameters which do not exist in any relevant sense of the word. Much like the compatibilists who illustrate how free will and determinism are not necessarily mutually exclusive, I would like to explore how morality could be both objective and not objective.
The purpose of really good philosophy, and really good philosophical education, is to encourage logical, careful, clear thinking. So, in the interest of at least attempting to do philosophy well, I will try to trace an intuitive explanation of these ideas. Such an explanation, while less scholarly, seems more likely to fuel thought and discussion (much like this instructor teaching Plato with sandwiches) than exhaustive argumentation for the position.
The Macroevolution of Morals: