The problem is that what you are ruminating over is probably not something that can be fixed by thinking. For instance if her husband is cheating on her, the wo

The problem is that what you are ruminating over is probably not something that can be fixed by thinking. For instance if her husband is cheating on her, the woman should confront him. So depression would be adaptive only for certain kinds of problems. Perhaps we over use it because in more primitive conditions we would be constantly reacting to life and would be acting on instinct most of the time.