When King Leopold's behavior became known the Belgium electorate he was deprived of his control of the Congo, and it became a Belgium colony.Hector's answer- Yes, white people did something awful, but then black people failed to establish a country after they left.
You do get why 15 million Congolese being slaughtered was a bad thing, and white people didn't do them any favors giving their land to King Leopold, right? This guy should be up there with Hitler and Stalin.