Trump's EO on South Africa doesn't mention "Whites" at any point--but it mentions Israel in the first paragraph!
The purpose of these sanctions is to punish SA for its actions against Israel, period. The plight of Whites is the excuse and the smokescreen. And even then, the Trump solution is the same as the Palestinians in Gaza: "help" them to resettle elsewhere, in other words make it easier for their racial enemies to ethically cleanse them from the sacred land of their forefathers.