'We are not a charity case of the US' — EFF MP Nqobile Mhlongo

The ambassador's wording was eloquent, it did not mention race once and it's reasoning was sound.
If the statements were the most inflammatory or controversial that could be found, which would be common practice for "media" I am not seeing the "racism".
A practical and pragmatic answer would be to not help a group of people who do not want help.
We can wait a few years from now, once Russia/China/Australia/whoever sets up shop, builds everything to extract the mineral wealth. South Africa will be starving after they finish stealing the farms and failing to manage them as they have so far. Much like Zimbabwe and every other nation that follows similar practices.
The US can then go in "liberate" the "good people" of South Africa, take everything it wants and if they try to seize "the means of production" the US can let them starve.
The real inhumanity, is not to allow women and children to starve; the real inhumanity is to artificially maintain adequate food knowing the population will become dependent, that the population will inflate unhindered (as any population does with adequate supplies). Then, once that support (food) is gone, instead of a few people starving it will be a great majority who starve, instead of regional unrest; nationwide strife.
It would be more humane for the population to never become so great that roaming bands of cannibals become common.
So, yeah, 5 years, maybe?