White slavers had no protection against tropical diseases and no knowledge of the geography of Africa for centuries. They simply traded guns and other things for their slaves.
There were times and places white directly captured slaves.
But it was certainly way out of the normal course of trade.
I’m not certain but pretty sure that in the first ‘Roots’ episode where Kunta & company are being driven, bound in yokes, the slave drivers are dressed in Arab slavers mufti very much like the native east African costume Barry Obama modeled for us.
Remember that outlandish (I. Just. Don’t. Care) outfit he had on, white, crossed in front, some sort of MC Hammer balloon pants and a round pillbox-type hat?
Yeah, Abe Lincoln indeed. More like Africa’s counterpart to Simon Legree and another aspect to our schizophrenic attitudes on race.