A lot of people disagree with me on this, I believe in mark to market.
You can't make a good deal with a bad person.
You pay a very high price in the stock market for a cheery consensus.
The managers at fault periodically report on the lesson they have learned from the latest disappointment. They then usually seek out future lessons.
We all make mistakes. If you can't make mistakes, you can't make decisions. I've made a lot bigger mistakes myself.
When you build a bridge, you insist that it can carry 30,000 pounds, but you only drive 10,000-pound trucks across it. And that same principle works in investing.