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I think the downvoting comes from the aspect that even your cited sources have nothing to do with the original story. Because the ethnicities you are talking about have nothing to do with the black/white or African/Caucasian basis of modern racism. And hence the scientifically correct differences between peoples in different parts of Africa in your cited studies are not helping in any way, nor do they prove anything in regards to the original question.
That’s the thing about racism I think: it’s never really making sense, because it’s based on pure pseudo science of the 19th/20th century.
Absolutely feel you, kinda similar situation at work atm. What frustrates me the most is that none of the IT personnel understands my frustration because most are not in that kind of IT community and don’t share the ideas behind all that. Just here to earn a dollar, whatever system we’re working on. No intrinsic desire to make the world better or at least more secure, none of that. Just robots and bureaucrats.