Martha C Nussbaum in Aeon:
There’s no emotion we ought to think harder and more clearly about than anger. Anger greets most of us every day – in our personal relationships, in the workplace, on the highway, on airline trips – and, often, in our political lives as well. Anger is both poisonous and popular. Even when people acknowledge its destructive tendencies, they still so often cling to it, seeing it as a strong emotion, connected to self-respect and manliness (or, for women, to the vindication of equality). If you react to insults and wrongs without anger you’ll be seen as spineless and downtrodden. When people wrong you, says conventional wisdom, you should use justified rage to put them in their place, exact a penalty. We could call this football politics, but we’d have to acknowledge right away that athletes, whatever their rhetoric, have to be disciplined people who know how to transcend anger in pursuit of a team goal.
If we think closely about anger, we can begin to see why it is a stupid way to run one’s life. A good place to begin is Aristotle’s definition: not perfect, but useful, and a starting point for a long Western tradition of reflection. Aristotle says that anger is a response to a significant damage to something or someone one cares about, and a damage that the angry person believes to have been wrongfully inflicted. He adds that although anger is painful, it also contains within itself a hope for payback. So: significant damage, pertaining to one’s own values or circle of cares, and wrongfulness. All this seems both true and uncontroversial. More controversial, perhaps, is his idea (in which, however, all Western philosophers who write about anger concur) that the angry person wants some type of payback, and that this is a conceptual part of what anger is. In other words, if you don’t want some type of payback, your emotion is something else (grief, perhaps), but not really anger.
Is this really right? I think so. We should understand that the wish for payback can be a very subtle wish: the angry person doesn’t need to wish to take revenge herself. She may simply want the law to do so; or even some type of divine justice. Or, she may more subtly simply want the wrongdoer’s life to go badly in future, hoping, for example, that the second marriage of her betraying spouse turns out really badly. I think if we understand the wish in this broad way, Aristotle is right: anger does contain a sort of strike-back tendency. Contemporary psychologists who study anger empirically agree with Aristotle in seeing this double movement in it, from pain to hope.
The central puzzle is this: the payback idea does not make sense. Whatever the wrongful act was – a murder, a rape, a betrayal – inflicting pain on the wrongdoer does not help restore the thing that was lost. We think about payback all the time, and it is a deeply human tendency to think that proportionality between punishment and offence somehow makes good the offence. Only it doesn’t.
More here.