&gt; altruism is perfectly at home with modern evolutionary theory<p>To add to your point, which I&#x27;m sure is in reference to macro-level phenomenon such as the interdependence of species, symbiosis, ecosystem complexity and the like, it&#x27;s important to note that multi-cellular organisms are the epitome of individuals (cells) working for the greater good rather than local self-interest. Eons ago single cells started working together and specializing. White blood cells, neural cells and muscle cells don&#x27;t compete against each other, much less is there white blood cell on white blood cell competition. When cells behavior breaks from the greater good, we call it cancer.<p>A perfect example of pure self interest is the virus.<p>Interesting that many people do consider capitalism akin to cancer, or that it behaves virally.