So, do you think that subjugation is any better when done by members of your own race?
At least the prior white rulers were able to maintain prosperity. They understood that, in order to have a working economy, you need to keep your workers happier than they would be moving somewhere else.
Blacks were moving INTO South Africa, even under apartheid, because they were able to get work that provided a good standard of living (by African standards) and were relatively safe from the random violence that characterised the rest of Africa. The current rulers have no clue as to how to keep things running, so they are looting what they can, until the point when things fall completely apart