I think this issue might get out of hand if it continues. The last time I heard about it, governments of both countries intervened and it cooled that. This new update goes to show that South Africa hasn't had enough yet. With the way the xenophobic attacks are going, It might turn into a full blown war. War isn't my thing. I just hope South Africans desist from such attacks. Good thing nobody died this time.
A black South African explained it to me once. He said basically, the blacks, coloreds, are all tribal. Different tribes will fight and have hatreds of each other going back a thousand years. The Whites are the peace-makers.
Given the recent Marxist President and his attitudes toward taking everything away from the whites, what you say is not unexpected.
Semi-related, when I was in Durban the Nigerians were the drug lords. Of course that was likely a small percentage of Nigerians and doesn't justify the violence you mentioned.