I don't think the US has extended any immigration hand to white Rhodesians or South Africans have we?
Dutch and British, you must be joking. It's clear you don't know anything about the Afrikaner. The only similarity is the color of our skins, and nothing else.
And these people,along with the coloured and blacks,who don't like what the ANC MARXISTS have turned their nation into,can NOT just pick up and go anywhere.
And since you think it's so easy to "just leave",I suggest that you try to do it,with the same challenges( money limits,visa lottery,etc.) that face those in South Africa,whom you "feel" can just go anywhere.