Up until last week, the man who first took a knee had been giving the world the silent treatment. Even as NFL players knelt in stadiums across America, as President Trump scoffed at them, essentially labelling them a "son of a bitch," and as seismic debates ensued on every network from CNN to Fox News—Colin Kaepernick evaded the bait, opting to let his charitable contributions do the talking. The onetime rising star and franchise quarterback for the San Francisco 49ers is, of course, without a job. He has been living in New York City, keeping a low profile and working...