The problem with arguing that cattle sacrifice was a semi-rational response to cattle disease was that the Xhosa didn’t just kill cattle. They also destroyed their crops and stored food. There’s no evidence presented that any disease was affecting their crops.
They weren’t genocidal…after all even the KKK-type racists wanted them for cheap labour as long as they didn’t agitate for voting rights or similar stuff.
All-black towns were completely destroyed with everyone run out. Yeah, the KKK were fine with blacks as long as they didn’t try to vote, take jobs from whites, look them in the eyes, ever be accused of raping a white woman (and it wasn’t only the accused murdered but any others they could find), etc.
There would have been one in Bartow, Florida, but the accused rapist fled town, which saved the black town from being destroyed [as discused in Arc of Justice. I can quote the book, if anyone wants me to.