RSA may be rapidly turning into a third world country, but the whites there aren't just farmers. The Afrikaners have been there 100s of years longer than the majority of blacks have and fee,l that it is their home. They've already put up with SO much that some just dig in their heels. And besides which, just WHERE do you imagine that they can go without a visa?
Get mad all you want, but South Africa is lost. The window to leave gets smaller by the day. It may already be too late for most, for all I know. Within a generation, whites will all but be gone. The SA government will eventually cut off their ability to acquire goods to trade and what will they do then? No community is so self sufficient that they can survive without the ability to trade.