It is my opinion that the goverment in collaboration with the intelligence agencies that represent interested parties in South Africa from a economical/strategical point of view have carefully planned the racial tension currently led by the ANC youth party and followers. It is what you call a "ventilation project" that ensures cropped up emotions that can lead to violence/ war/instability are popped before a specific critical period. In other words the indicators were there that could have caused problems during the World Cup. Racial tensions in South Africa has been more surpressed than anywhere on the planet due to the historical vs.recent events in our transitional politics.
An successfull strategy by "Effective" governments has always been to cause some huge flashpoint to  1- expose those that in a later stage could have caused terror without been detected to blow up in a stage where the logistics are set up to detect those elements.(THE REAL RISKY INDIVIDUALS HAS ALREADY EXPOSED THEMSELF ON FOR INSTANCE FACEBOOK /TELEPHONE/BARS/WORKPLACE ETC)  2. Thus ensure a reduced risk during a critical period such as elections/ major events such as the world cup etc. 3-The APLA attacks at the time in the SA politics when all parties were reaching a joint solution is one example. Theres many others led by the CIA throughout the world. 4- All of a sudden Mugabe is also visited to reduce the risk he has on the world cup, acting as if South Africa could follow his example with land reform. It is indeed all a act by the South African Goverment. 5- the most important result (positive) of such a staged problem is that it does cause the majority of people to ventilate cropped up feelings. The problem person however goes over into action. And he can be removed  before the critical period becaurse lets face it..SA can illl afford serious incidents during the world cup.
The reasons are clear. Zuma and the Government has not condemned the call to killing of whites becaurse they want it to reach absolute boiling point. Mandela has not said anything. etc. In a few weeks time they (ANC) will play their cards and will defuse the tensions-..they will think. 
It will have the opposite long term effect. Young white have now been made racists as well as blacks. Many moderate white have now been changed into racists. And rightly so. It is natural to hate someone that call on a group to kill you.
The problem is if the only sane leader in South Africa, Mandela would pass away in the next few days (and of course he wont) we have real trouble on our hands. 
Normally when this type of planned eruption occurs and is streched out like the current one, is that all the media attention is diverted from some other poitical/security manouvre. The attension is removed from the real risk--hope you know who this is..?? It is also a good reason to pick them up by the joint international security services...becaurse of the cover or excuse of the security situation..