I have never ........ heard any inhabitant actually say that they would like to go back to colonialist rule, no matter how dreadful their present Government might be. It's their Government, is the point.
I have never heard or read any black South African say "Bring back a white Government". All I hear is white South Africans telling me that black South Africans are saying that. How come white politicians don't get voted into power, I wonder, if the black population thinks that?
Then I would hazard a guess that you're moving in the wrong circles, or you just choose not to hear it, because I hear it frequently, particularly in ZA and Zim, to a lesser extent in Zambia and Mozambique, although the whites are going back there slowly.
White politicians won't get voted into power in a one party state, unless they are standing for the ruling party - and some have done so.