This is not about those tweets any more. The last few weeks have been what can only be called a witchhunt. 
I used to agree that it would be better for her to just let it go, but round about when the first commentators starting comparing Zille to Zuma, when real hatespeech by black people (Velaphi Khumalo), and real racism by black people (like Fikele's rant on Mmusi's wife) has no consequence what so ever, when I realised this is about a trend in South Africa that will lead down a dark path. 
Zille is definitely not a racist yet you expect her to plead guilty to it.
So this is what it's going to be like ahead in the future? No, there will need to be a way forward for all of us together if we will not widen this rift even quicker than it is now. And that includes sometimes not being politically correct.