Bringing race into the numbers is pretty much meaningless, since the numbers don't measure race. Introducing a some variable in order to find a correlation, for some political purpose, is at the very least junk science. Trying to establish blacks as the cause of the high numbers, instead of conservatism and religion, is a gasp, because it doesn't correlate to human nature, or reality.
Human nature dictates the more something is restricted, sex, porn, religious conservatives, the more people go after it.
Reality, because blacks have dramatically disproportionately less access to computers and the Internet, especially in the South.