Anger, for me, can be one of the greatest motivational forces to elicit change. It signals, on the emotional level, that something is not right... and can induce a drive to change it in different ways I have access to. But it needs to be channeled constructively and not excessively. I was quite out of touch with my anger in my youth but discovered it as a wonderful (albeit sometimes unpleasant) source of energy in middle age. I wouldn't want to stifle it anymore, just keep an eye on how I use it.