Here’s a look at the future, and probably not that far into it. People will learn two things: 1) That an officer was not indicted for murdering Eric Garner—black, 43, and detained simply for selling single cigarettes—despite the fact that the killing was recorded from start to finish for all of America to see. 2) That an officer was not indicted for killing Michael Brown after Brown had stolen from a store, refused the officer’s request to step aside and perhaps tried to grab his gun, with the officer shooting when Brown repeatedly lunged toward him for some reason, with...