The general problem with sociobiology , evolutionary psychology and all social "darwinisms " is that they have a theory that the original human nature, the human nature of human evolution, was selfish like the ideal human in bourgeois or class divided society. Basically this idea is a reflection of private property ; that the whole of human society is the sum of individual parts , selves pursuing selfish , individual interests. This is not human nature , but dominant in the period of human written history and class society starting 6,000 years ago. The selfish individual is a product of capitalist culture not human nature.