I didn't respond because I live in a different timezone and have a job...
I don't have a list of individuals that would indorse slavery. I have a list of scenarios that would increase the chance that slavery would occur. I think that if South Africa experienced a black uprising that whites were able to suppress that slavery of at least some of the population would be a real possibility. It is hard to say who would advocate that or that such a situation would even be meant to be. My argument is literally this:
South Africa undergoes a black revolt
South Africa's white leaders and population become more reactionary. They suppress the revolt.
SOME and only SOME of South Africa's blacks become slaves in the post revolt.
It really isn't that unlikely. They might not call it slavery...but how they would treat a lot of blacks would be slavery. So my counter question is do you think that South Africa couldn't have undergone a revolt or insurrection by blacks? I ask not in combativeness but because I don't know much of South African history.
You did respond to someone else after my initial query though.
Yes, of course South Africa could have undergone a violent insurrection - in many ways the 1980s had exactly that. What is more likely that in a scenario where there is a revolt which the white government wins, partition will be the result. South Africa will be split into two, with a white state and a black state.
There is no scenario where white South Africans would reintroduce slavery.
What many people on this thread seem to believe is that white South Africa was some sort of Nazi state. It wasn't. It was certainly a police state, but for whites there was relatively free political activity, and civil society, sections of the the media, and academic institutions were all heavily critical of apartheid and the government.
It is impossible that white South Africans would reimplement slavery, and it is impossible that black South Africans would be accepting of it.