Quote from AAAintheBeltway:
This is precisely the reason this kind of thing is newsworthy.
We know very well that if a couple of white kids ganged up on a defenseless black and tried to kill her, white men working there would have intervened. And if the black victim had been left suffering a horrifying seizure, it would have led the evening news shows for days and been page one news on every newspaper. There would have been congressional investigations, Jesse Jackson, Al Sharpton, Obama and every other black race hustler in the country would have organized demonstrations, and the perpetrators would get long prison sentences. The white community would have turned them in a minute.
We know that is true because it has happened over and over.
The more normal situation of black on white violence, typically a gang of blacks on a lone white, is mysteriously regarded as not newsworthy, and publication of it is deemed racist. There have been numerous recent incidents of gangs of blacks beating whites on busses, subways, at the Iowa state Fair, etc and there is no public comment. Police treat it as no big deal.