I don't agree with Dawkins' hard-atheism, but I do think the basic argument of The Selfish Gene explains much of society. People are fundamentally concerned with propagating their own genes, and they are much more willing to be generous toward people who share more genes with themselves. Nordic-style social democracy was only possible in homogenous countries full of intelligent people. As the Scandinavian countries start to look more like Brazil, so too does their economic model. With diversity, you get rampant corporate exploitation, wealth inequality, and widespread criminality and corruption.