Agreed. I can't see any reason to harm his family or even make them a part of anything Malema does. Threatening his family is not only incredibly stupid, but pretty pointless. I say this because the political climate in SA at the moment is far bigger than Malema. He is simply a symptom of much bigger problems. If it wasn't for him there would be someone else like him.
SA has some deep issues and I don't think anybody truly knows how to fix them apart from starting to root out corruption. That's a good start because it's the poor and disadvantaged that are suffering the most, allowing people like Malema to stir them up. The root cause is not Malema. It's corruption and poverty.