Given the primitive life that existed in Africa at the time, being bought by white people was the equivalent of being visited by beings from the future possessing magical technology. And since many primitive cultures have folklore myths about white Gods arriving on ships, the Africans being bought up at the time probably thought that they were being claimed by a deity.
They were claimed by a deity. They were taken out of the Stone Age, brought to a land of milk and honey, and put in some sweat equity so that their descendants could live better than 95% of the rest of the world. Including the blessed Darkie Continent. If anything, he should thank us, and be on his way.