One day, there was a problem at work. It was not a disaster. Someone did something improperly and it resulted in a small localized mess. I suggested to the supervisor to circulate an email that anyone who wanted to do ...XYZ... should contact Mr. (me) and coordinate with me. Prolem solved.

Nope. Supervisor was not interested in solving the problem and guranteeing not to happen in the future, he was more interested to investigate WHO did it in the first place.

Some of you may agree with him, but consider this: Two guys have already resigned. And this problem is nothing but an innocent mistake. Not much harm has been done. We should just circulate the lesson and design a proper procedure for future situations. Case closed. But how can you convince a diffult supervisor who is full of mistkes and only sees other people mistakes ???