They've never been "domesticated" because domestication requires a level of active eugenics to breed desirable domestic traits and cull undesirable ones. Whites have done the opposite by encouraging the proliferation of non-domestic traits/behaviors like violence/low IQ out of some naive pity and guilt.
Worse yet, Whites have intervened and effectively stopped blacks' environments from naturally selecting the fittest members and ballooned a population of 300 million starving Africans to 1.5 billion starving Africans. Genetically, these Africans are the ones who are more successfully dependent on and can extract resources from naive White altruism.