Did black people own slaves? Your source deduces from the 1830 census that about 0.6% of slaves in the US had black masters, although the same scholar who's quoted there also argued that many of the slaves would have been family members of their masters who had purchased them to protect them. 

In other words, you're citing the exceptions as if they WERE the rule. What is it that you hoped to this would show, anyhow? That not all black folks were saints? Well, what a surprise! Who said they were?

You might note that, given the 1830 census again, that still means that 1.9 million black slaves were owned by whites, probably about 98% of the total. By your logic, what does this show? I mean, if the 319,000 free blacks owning 12,900 slaves indicates that African Americans are morally impure or something, wouldn't the white folks owning 1.9 million black slaves make them akin to the devil himself?