Your last sentence is blatantly racist. The NP caused far more destruction on the people of South Africa (not least of which declaring some 60% of them to be citizens of entirely fictional countries OTHER than South Africa) than the ANC has done.

The ANC, especially the Zuma ANC, has been a pretty terrible government - but to pretend it's the worst any organisation has done in this country is just plain racist in the extreme. Hell even if we entertain your racism it's not even the worst that any organisation has done to WHITE people ! That record must surely belong to the British Military for the concentration camps !

Hyperbole can be an effective and legitimate rhetorical tactic (I often use it myself) and is generally understood to not be meant to be taken literally - but I fail to see any such merit to what you said, it smacks of extreme myopia at best, and flagrant white supremacism at worst. 

Either option destroys whatever legitimacy your argument may otherwise have had.