We’re getting angrier, about a lot of things. It’s the dominant emotion in western societies on a daily basis. That hothouse of anger–social media–is even more ablaze with rage (according to a new study). Frustration and moral outrage explode against a great deal we cannot control or even influence. It’s an emotional contagion where seeing people express anger drives others to display it too. And our own irritability works in the same way. Every outburst legitimises the next. How much of this is righteous anger? And how can we resist sinful anger? We need to know. One of the clearest...