Here is what the local newspapers did not report about the mob of dozens of motorcycle riders who chased, stopped and beat the father of a young Asian family on a Sunday afternoon in New York City: One, the mob was black, says the police report. Two, this is merely the latest of several such examples of racial violence on wheels, witnesses say. Except this one is on video. All six minutes and 27 seconds of it. Recorded on the helmet-cam of one of the members of the black motorcycle mob. “The newspapers say it was a motorcycle gang,” said...