Underpopulation of the productive demographics, and population growth of the counter-productive.
“Never underestimate the power of stupid people in large groups.”

further details here,

the population bomb is not the problem, underpopulation is the problem

They did but dismantled them before the handover to the African National Congress. Wisely. They remain the only country ever to have nuclear weapons and give them up (as opposed to repatriating nuclear weapons belonging to and under control of a foreign power, as the former Soviet republics did).

It’s too early to say that the tide is turning, but nothing is impossible to God.

One of the good reasons not to demonize Bill Gates is that he, like Elon Mask, is single-handedly focused on one of the existential problems of the humanity.
For Musk, it’s the risk of a planetary extinction event.
For Gates, it’s the population bomb the Third World (particularly, Sub-Saharan Africa) is.

Do they?
(They do have deposits of uranium, that’s for sure.)

the two lead countries in the West, the US and the UK, looked away from the damage that Mugabe threatened because Ian Smith, was bad, ok, and Muzorewa was not authentic enough, hence a generation or two was blighted his made in China toxic brew, there are speculation that one amenable rebel leader, Chitopo was zeroed out, to make way for Mugabe, the official, that was reportedly involved was kept on by Mugabe what does that tell you, Even the Reagan administration did not notably move against him, as they did against
Nujoma, Chissano, and Dos Santos, then again was there any rebel network to
rally for,

just a few years later, you have the South African Total War and the Umkhonto final onslaughts, they were easy to hate, demography and justice argued against them, I think I became aware of Mandela in high school, when they did one of those pointless charity events, by musicians, on the anniversary of his imprisonment,

much like the Maryland Man or Effendi Khalil the reason for his detention was passed over in most media,

the Rivonia trials, may have been flawed in some ways, but they were about an attack on the Capitol in Johannesburg, you get a sense of this in Wilbur Smiths rage, of course imprisoning Mandela did not stop Umkhonto, any more than doing that to Arafat or Sheikh Yassin

Good for Trump. Something like this needed to be done. Worrier that I am though, I can’t help wondering how he’d react if some foreign leader “ambushed” him like this. He can’t count on always being in control of the situation.