Following weeks of feverish chat about boycotts, we may have learned something. Boycotts are about more than hitting the “like” button on a social media post. Principles cost. Boycotts hurt. They hurt not just the intended target but the executor. In other words, you don’t withdraw from a mammoth Ed Sheeran tour just to look cool with your peace sign. It won’t just break your musical heart, it will probably destroy your solvency plan. When Ed Sheeran’s Irish backing band, Beoga, left the tour in solidarity with one of the opening acts, US rapper Macklemore – who used those enormous...