David Brooks in today's NYT: "The question then becomes: What shapes moral emotions in the first place? The answer has long been evolution, but in recent years there’s an increasing appreciation that evolution isn’t just about competition. It’s also about cooperation within groups. Like bees, humans have long lived or died based on their ability to divide labor, help each other and stand together in the face of common threats. Many of our moral emotions and intuitions reflect that history. We don’t just care about our individual rights, or even the rights of other individuals. We also care about loyalty, respect, traditions, religions. We are all the descendents of successful cooperators.
