There's long been a violent Clash of Cultures between the Muslim World(especially Arab) and the Afro-pagan World. Arab Muslims considered black Africans to be wild, savage, lascivious, and beastly. So, Arab Muslims not only enslaved black Africans but castrated them to tame their Jungle Nature. It was Jihad Justice against Jungle Junk. This went on over many centuries. Scholars say Arabs enslaved millions of black Africans, seeing them as little more than animals.
But Arabs also spread Islam among black Africans, and many black Africans became Muslims and waged Culture War on other black Africans who were seen as mired in tribal-pagan-savagery.
As both the West and the Muslim World were dominated by spiritual institutions, the main thrust of their moral-cultural narrative was directed against black African savagery that was regarded in a negative light, not good for much of anything. White Christians and Arab Muslims felt that black Africans had value only as slaves or converts to Christianity or Islam. They didn't find intrinsic value in black African-ness.
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