Direct Evidence Of Moral Behavior From Evolution

My working hypothesis is that Game Theory and simple rules derived from self-interest are sufficient to generate self-organized behavior that is labeled as "Morality". Here's more evidence to back that up.

Evolution Guides Cooperative Turn-taking, Game Theory-based Computer Simulations Show, ScienceDaily.com

"We published indirect evidence for this in 2004; we have now shown it directly and found a simple explanation for it. Our findings confirm that cooperation does not always require benevolence or deliberate planning. This form of cooperation, at least, is guided by an ‘invisible hand’, as happens so often in Darwin’s theory of natural selection.”