Ethics, survival, and loose wiring

From the annals of science:

Using a tool called the ultimatum game, researchers have identified the part of the brain responsible for punishing unfairness.
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But now, Ernst Fehr, an economist at the University of Zurich, and colleagues have [concluded that the] region supresses our natural tendency to act in our own self interest.
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"Self interest is one important motive in every human," says Fehr, "but there are also fairness concerns in most people." "In other words, this is the part of the brain dealing with morality," says Herb Gintis, an economist at the University of Massachusetts in Amherst, US. "[It] is involved in comparing the costs and benefits of the material in terms of its fairness. It represses the basic instincts." Psychologist Laurie Santos, at Yale University in Connecticut, US, comments: "This form of spite is a bit of an evolutionary puzzle. There are few examples in the animal kingdom." The new finding is really exciting, Santos says, as the DLPFC brain area is expanded only in humans, and it could explain why this type of behaviour exists only in humans.

Is group evolution possible after all? Wouldn't a species cost-benefit analysis contribute to long-term survival?

Compare: The Piggy Problem, Schelling's take

My source with link to original