Interesting OP. There will always be people adhering to polarised, even extreme, viewpoints. Militancy and confrontation will always be a driving force for some. I have been to South Africa and overall it was a very positive experience. From what I saw, however, there is still inequality and poverty that affects a disproportionate number of black citizens. My impression was within the government there is a significant minority of people prepared to focus blame on the legacy of the oppressive white regime for continued problems in the country.
There is no doubt some truth in this - the impact of years of apartheid cannot be undone in even a couple of decades - but what better way to distract attention away from the failings of the government than by encouraging continued resentment of white authority and colonial history.
Of course, all of this spoken by a middle class, reasonably educated, white male with absolutely no history of persecution (other than as a JW at school!), oppression, lack of opportunity etc... So what the hell do I know really?