Colin Kaepernick. Remember him? Below-average quarterback. Above-average poseur. Not “activist,” not really. Activists actually say stuff. Kaepernick almost never says anything. He’s like the Queen or most popes — you have to read the deep-background musings of supposed members of his inner circle to get a clue as to what he might be thinking. Kaepernick hasn’t played in the NFL since 2016, when anyway he was merely the disappointing starter on its worst team, and given that dozens of quarterbacks have entered the league since then and that he’s been gathering rust like the Tin Woodman for three years, he...