Thanks to Thinking Meat for this article in the Economist.  It challenges the idea that our Pliocene hunter gather past was some form of ideal society.  Romanticism without evidence was a de facto theme of my recent concern about Dave Pollard and his polyamorous intentional communities.  I have given up there by the way, see the comments here.

Now there is a lot we can learn from that past, but we need to be careful.  It is not only the danger of idealism, but also of naive scientific determinism.  I have the Oxford Handbook of Evolutionary Psychology on the table beside me and it has some great material.  However an evolutionary disposition, does not make a certain type of behaviour inevitable, it just makes it more likely with the right environmental trigger.  It is the old nature/nurture argument again: nature creates dispositions, but nurture provides the stimulus, and therein lies our pragmatic responsibility.