Is western civilisation based on a mistaken understanding of humanity? Fundamental to any society is its comprehension of human nature. It shapes attitudes and policies on a whole range of issues: interpersonal relations, child-rearing, discipline and punishment, economics and welfare. For millennia western societies were based on the idea that human nature is flawed. This was turned upside down 300 years ago during the Enlightenment by writers such as Rousseau, who argued that we are born good and later warped by parents and society; a liberal view of human nature which is now being...