Where are these numbers coming from? I know the incidence is high for black on black crime, but the post would carry more authority if there were attribution for the figures.
Tracing from that blog to SooperMexican to The Blaze finally points to this Department of Justice report: http://bjs.ojp.usdoj.gov/content/pub/pdf/bvvc.pdf
These statistics come from the Justice Department.
http://www2.fbi.gov/ucr/cius2009/offenses/expanded_information/data/shrtable_02.html