Evidence-based medicine might sound like a tautology — what kind of medicine isn’t based on evidence? I’m afraid that you’d be surprised. Massive decisions are often taken on misleading, low-quality evidence. We see this all the time. In the last pandemic, the swine flu outbreak of 2009, I did some work asking why the government spent £500 million on Tamiflu: then hailed as a wonder drug. In fact, it proved to have a very limited effect. The debate then had many of the same cast of characters as today: Jonathan Van-Tam, Neil Ferguson and others. The big difference this time is the influence of social media, whose viciousness is something to behold. It’s easy to see why academics would self-censor and stay away from the debate, especially if it means challenging a consensus. Academics who are tenured, like me, don’t have to worry so much about people pulling strings above us. This is the importance of tenure; it allows academic freedom. In a crisis, when tempers run so high, you need a variety of views more than ever.