Think of psychology as being like a language. To tie a language purely to evolution would be misleading. People do not speak French because the climate of France or the architecture of the cities compels them to. People in Quebec do not speak French because there is some geographic equivalence which is manifested that way as an emergent property. Instead, language has a completely different propagation, one which has some geographical overlap, but the more scientific study of language looks at etymology and history - to influential contributors like Shakespeare. Language is not driven by public bodies, which have their own history aside from the one we share, but by private experiences.