Human population structure is such that it would require either (or both) a strong selection pressure or a big increase in fitness for natural selection to dominate the evolutionary dynamics. I submit as evidence that humans were not subject to intense selection pressure from predation one word: crying, specifically the crying of small children.
The idea that a primitive band of reproductively successful humans could remain hidden from things like leopards boggles the mind of this father. And, I have thought this for a long time, before I had children. It is in no way related to the fundamental conflicts generated by bed time and potty training in the mind of a two year old child. Nothing at all.
The Finch and Pea 