In Ratmetric's case, it's not just one "mistake", it's the overall attitude towards the forum as a cow that has to be milked at any cost. Old toothless cow but it does sometimes kick those entitled farmers in the face.
I agree that it's not one mistake. This happened because of his behavior and attitude. But my point was, he could have handled the situation very well. Even scammers are sometimes given a pass by the community due to insufficient proof. Ratimov wasn't a scammer. The problem is, he never handled criticism in a good way. He could have accepted the criticism.
Instead, he always attacked people who pointed out his bad side. People learn from their mistakes, but if someone believes they are always right and doesn't accept criticism for their wrongdoing, they are not going to survive.