Nic,
I find the quote from the 47 Watchtower to be terribly ignorant and obviously written from a white man's viewpoint.
I am not African, but I was engaged to an African, and knew several of his African friends, and I would say that they DO know love, but on a deeper and more spiritual level to the white man. They have love within themselves, and a spirituality that most white men lack. eg. Compare the harmonising and enthusiasm of black gospel singers to the dry renderings in mostly-white Kingdom Halls.
The African way of thinking may not be the same as how a white man would perceive things, but then why should it? We all are affected by the cultures we grow up in, and the culture we choose to live in. Culture affects our attitudes, ways of thinking, likes, dislikes and often the religion that we believe in, or not believe in.
AS for Adam and Eve, I've always pictured them as being a mixture of the future races, so that maybe Adam looked more like part African/part Hispanic, while Eve was part white/part Asian. Who knows? Does it make any difference to us how the Society portrays them?