Postscript to the thread:
The 1983 constitution was so controversial among White-supremacists that it split the government.
The National Party, a fascist party formed from the remnants of the WW2-era pro-Nazi Ossewabrandwag movement, had ruled South Africa since 1948. They had created the Apartheid system as part of a general strategy of a) creating a more unequal society, and b) defending that inequality. They worked hard at this and some of them were smart about it. They were generally willing to change the system, even to make compromises, in order to do (a) and (b).
A group called the Conservative Party split off from the National Party because even the show of compromise was too much for them. They didn't want even one powerless Coloured person in government. They didn't agree that White supremacy was something that needed to be updated now and then in order to remain intact.
Some of the Conservatives didn't like change at all, some of them focused on the appearance of politics rather than the realities of power and so were fooled by the fig leaf, and some forgot that White supremacy is a difficult thing to keep going.