Let's just get the semantics out of the way here.
Not all child rapists are black but child rapists with the intent of curing AIDS? Yes. If you can find an example stating otherwise, then we can review. Surely this makes sense?
And surely you can see how this principle highlights the difference in Lulu's statements since whatever truth there may be to what she's saying, she is generalising hugely: "Young Afrikaner men are brought up in the Calvinist religion believing that they own a woman, they own a child, they own everything and therefore they can take that life because they own it."