Yes, there was a valid reason for Apartheid. But once again, you have a certain group of people seething with jealously and rage who despises Whites having their own homelands so they have to do their usual tricks to undermine them. Just like Rhodesia, just like Europe now, and just like the U.S., Ireland, and Canada now.
Demographics is destiny, unfortunately. This is also why I believe civic nationalism to be an abject myth.