The New Censors

After the 1967 summer of riots, journalists, politicians, and sociologists spent many words and dollars trying to find and cure the “root cause” of the racial unrest. They failed, but eventually a solution did emerge. The root cause of riots turned out to be rioters. Peace returned to the streets once police adopted new crowd-control tactics and prosecutors cracked down on lawbreakers. Mob violence came to be recognized not as an indictment of American society but as a failure of policing.

That lesson was forgotten last year, when police were...