youngmafbog, I've no doubt that what is happening in the world is the motive behind this attack. Nevertheless, the attack is a mindless one.
AOG, //they themselves are black, so presumable their ancestors came from Africa, so what right had those two to tell their victim to go back to Africa. //
You appear to think that regardless of their ancestry, because these people are black they don't belong here and therefore they had no right to tell this woman to go back to where she came from. That's the long and short of it.