Because of the same reasons why some people say the ancient Greeks were all looking like British people. The Northern Barbarians were living in caves and eating mooses back then and the sub saharan africans were living in the jungle engaging in canibalism back then. read more
Yes, I don't blame these people for not knowing the truth. Just take the words of most ancient Greek texts themselves stating that the first native settlers of ancient Greece were black bringing technologies including the invention of math itself from Egypt, which was the first major industrialized country. read more