I'm reading "The Moral Sense" by James Q Wilson in the evening. Good point: that we all have a moral sense and engage in moral reasoning. This is clearly shown because when people behave immorally they still always provide a justification for what they did--"she deserved it, it was necessary for the greater good, I got carried away," etc. But no one besides mentally ill people act immorally because it's "good" to do so in itself (e.g., murder, stealing-- unlike creating life and gift giving, which are essentially good in themselves). Wilson is a professor at UCLA and his book will be showing an evolutionary and sociological basis for morality. I'm very intrigued by this because I'm most familiar with the theological and biblical arguments.