Anger as motivation
I rushed to get the link up and neglected to put up my own thoughts. I feel there is nothing wrong in using anger as a motivator so long as you understand the risks and price of doing so. I have some friends who are athletic, and use anger to push themselves. I have many friends who are activists who use anger every day. So long as I am sure that they understand what that can cost them, I wish them the best of luck. Just be aware that you must not let that anger consume you. Then it becomes much darker and more dangerous.