A lot of people think of Twitter as a public utility, a public trust, “the town square,” a company with an important social mission that many of its users and employees and Elon Musk care about deeply. And its CEO and board of directors essentially can’t bring themselves to talk about it. When employees asked him about what was best for the company, Agrawal could talk only about the shareholders. Elon Musk is not at all embarrassed to say that Twitter has an important public mission, wh...