Great leaders take responsibility for EVERYTHING.
They turn each misstep into an opportunity to learn instead of pointing figures according to Ron Gibori. They pull the thumb and ask themselves, "what could I have done differently?" They find a lesson while others only see a problem. They privately address mistakes from their team but take the blame publicly without dissent. If someone slipped up, they pick them up; they don't point the finger and pass the blame.
When you lead a group of people, they become reflections of yourself, and when you are humble enough to admit your mistakes, it reinforces the habit of others to do the same.