Moral courage is a rare commodity, rarer still today. Those who stand up—frequently alone—to shine a light on corruption, deceit, and discrimination at the risk of their reputations and livelihoods are worthy of admiration. Republican representatives Liz Cheney and Adam Kinzinger, singer-songwriters Joni Mitchell and Neil Young, football coach Brian Flores—all have gone it alone in standing against reprehensible behavior,...