Race has nothing to do with any crime. The way people were raised has everything to do with it, though. It is very small minded to blame a race for the disgraces of a country (and crime, unfortunately, is a big disgrace for South Africa).
My view is that people (of any race) become criminals due to the environment they live in (with exceptions, of course). Put a white child (or Indian, or Black, or Japanese) living amongst criminals and most likely that child will become a criminal as well.
I wonder how many black children adopted by loving families become criminals. Not many, I'd assume.

For what I understand, Shamiri actually did say that all races commit crimes in South Africa, not only blacks. So I really don't understand why Shamiri and Abu are fighting, unless I'm missing something here.