Four experts had an appointment with an ordinary man. They needed him to ratify their findings, or anything they achieved would be meaningless. As they drove to meet him, they knocked down a man on the road. He was dying. If they tried to save him, they might miss their appointment. They decided that their appointment, which concerned all of us, was more important than the life of one man. They drove on to keep their appointment. They did not know that the man they were to meet was the man they had left to die.