Didn't read through the whole thread, but here goes...
The fact isn't racist. Your determination that the number difference is because of black culture could be construed to be racist, however. The number disparity could be for any number of reasons, such as economic, environmental, etc...
i.e. your results would be totally different if you didn't count all white people vs. all black people, which as a whole do not have the same socio-economic standing, and instead counted whites and blacks in similar situations. For instance, how many gun death's per 100,000 poor, jobless white people living in inner city housing projects would there be compared to blacks in the same situation? I'd bet that if the numbers weren't virtually the same they'd at least be a hell of a lot closer. Likewise, if you only counted blacks that worked for Boeing, drove beemers and lived in the suburbs and compared them against white's in the same socio-economic situation, your numbers would be closer if not identical as well.
That study would need to have more breakdowns of white/black gun violence and show that economics and enviornment have a negligble effect on the statistics for it to really support your argument that black culture is the primary reason behind their gun-related deaths, Rip.