So you are of the "you make a mistake and thats the rest of your life" type? This was when he was in college. He was basically still a kid. Even then he knew he made a mistake, and he reported himself for it, and sought counseling. You think he should NEVER be allowed to coach anyone ever, because he got into a violent altercation as a college kid THIRTY ONE YEARS AGO, and immediately sought treatment for his issues?
No one is DEFENDING his actions. They were wrong. He knew it, we know it. But to hold it against him for the rest of his life, when he sought help, admitted his wrongdoing and did everything he could to correct it? What is wrong with you? I sincerely hope you never made any mistakes in your life.