For the student of racial violence, a white riot is the Holy Grail: often talked about, but so rare, some doubt it even exists. This is in contrast to the epidemic of more than 500 cases of recent black mob violence in more than 100 cities – documented in the new book “White Girl Bleed a Lot: The Return of Racial Violence and How the Media Ignore It.” On a recent Jesse Lee Peterson radio show, a caller disputed the idea that black mob violence exists out of proportion. White people are just as guilty, she said. It’s just they...