It has nothing to do with pigment levels, bigotry, racism, or any other ism. There are cultures who will stone you to death for wearing the wrong clothing, or tear you limb from limb on the spur of the moment for practicing witchcraft. They merely remain violent and barbaric when they get oil or diamonds or whatever; the natural resources do not make them that way. (The claim was that the natural resources were what changed Saudi Arabia and the Congo into violent cesspools.)