What does the theory of evolution have to do with morals? Can it explain why we feel guilt or love? Or why men cheat?
Evolutionary psychology is an attempt to use evolution to explain why people are the way they are. The theory posits that the many many cultures have many items in common, these commanalities cannot be explained by conicidence alone, there must be some reason that humankind has developed these cultural norms. Wright, and other evolutionary psychologists would argue that as human beings evolved certain psychological traits were more conducive to an increase in descendents and therefore became the norm.