I see what you're saying, but let me put it this way. Take ten black murderers and ten white murderers. Odds are that most of the victims would be white regardless of the perpetrator, right? In reality, however, only one of the ten black murderers would be killing a white person with the other 9 killing other blacks. According to population you would expect it to be the other way around. One out of every 10 blacks would be killing a black and 9 out of 10 would be murdering whites. That isn't the case, of course, but you would expect it to be that way.    The average black murderer would have many more white targets than vice-versa. This explains why there's more black on white homicide than white on black homicide.    9 out of 10 black homicides are against other blacks, but that's really disproportional when you look at population.