Aha! Voila, the nub of the argument is revealed. FWIW man's genetic lineage first emerged about 7 million years ago in an ape which took a slightly different evolutionary track to other apes. About 2.3 million years ago early hominids began to appear. Modern man, called Homo Sapien, began to impact on the world 100,000 years ago. There were other hominids about but Sapien was the most successful and the others died out by 50,000.
Clever tool usage dates from 300,000 years ago and proto language from 1.2 million but the ability to talk and communicate really launched with Homo Sapien 100,000 years ago. The development of language is considered to be the defining characteristic of our success as a species. Communicating information and ideas stimulated brain function and we grew ever more intelligent.
As for selfishness, altruism, etc evolutionary psychology has a lot to tell us about our modern behaviours. We might think we are very civilised and sophisticated but our reptilian brain just above the spinal column still provides our most primal responses - and actions. Fight or flight. Sexual connection. Protection of our young, and self preservation.
I appreciate you probably won't read this Ed so we'll just have to agree to disagree.

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