Nathan J. Robinson, at Current Affairs:
All else equal, depressed people know more than people who have not been depressed. I do not mean that more intelligent people tend to be depressed. I mean simply that a person who is depressed has had an experience that a person who has not been depressed has not. They know the depths of human misery, and this is important, because it means they know that misery exists and what that means for a person. This does not automatically make a depressive more empathetic. But it does make them aware that all is not right with the world, that there is a terrible darkness in it. It helps them see through cheerful lies about how wonderful everything is and how we should all just appreciate it and be happy.
A problem is that the people who think they matter the least are unlikely to think they have the capacity to do anything vital and important. (Unlike Trump, who thinks everything he does is vital and important.) But with so great a gap between human potential and the world we have actually made, every single human mind that can be put toward the project of improving the world needs to be. The brutal Social Darwinism embodied in Donald Trump will triumph unless the modest and compassionate assert themselves and believe in their importance. Every last person is needed for the mission of resisting the descent into cruelty; all forces that can be mobilized must be mobilized.
If you've ever wondered — as I have — why we go on despite all this: I recommend reading the whole thing.