People who are continually angry devour, at least, much of what is good about them. An angry coach loses his capacity to think -- to rationally assess, understand, and solve whatever needs a solution.
One of the dangers of being angry is that once a coach starts on it, he is apt to get much more than he bargained for. And so do the objects of his anger.
The coach should have a good reason for it -- and be in control of it. Meaning, anger acted out as a tool -- to teach or get one's attention -- can be an effective coaching device. It should be purposeful, calculated, and controlled.
One million brain cells are destroyed every day. Coaches shouldn't waste what they have left -- and need.
We may ride anger for a short while, but it will ride us in the long run.
From "Coaching The Mental Game" by H. A. Dorfman