That's easily explained by 1) whites being more numerous than blacks and 2) a large fraction of homicides being against family members or close acquaintances.
Per person, though, as we saw above, blacks are
seven times more likely than whites to commit violent crime against whites. Blacks constitute about 12% of the US population (dunno if my source for this is using the same definition as the BoJ, though) but are committing a lot more than 12% of homicides.
[citation needed].
The information I quickly found on Google is against you, BTW.
http://www.infoplease.com/finance/economy/people-poverty-characteristics.html
About three times as many white people (27M) as black people (9.4M) live in poverty as of 2008.
Harking back to this chart:
I don't see white people at 3x the rate there. That's "poverty", which is measurable. Got any citations for "hopelessness"? You're going to need some
very good sources if you want to stand by your use of the word "exclusively".
(Or you could accuse me of being a racist.

)