Racial violence around the country is spreading into schools and growing in intensity. And thanks to YouTube, school district superintendents and the media are having a harder time denying it. The latest episode took place this week in Woodland Hills High School in Swissvale, a suburb of Pittsburgh. For two days, 70 black students – and some parents – were punching, kicking, and terrorizing themselves and neighbors. A “riot,” said Swissvale police chief Greg Geppert. All on video – a video “too graphic for WTAE news to show in its entirety.” “At least three of the people we see in...