The danger, one you see often in investing, is when people become too McNamara-like—so obsessed with data and so confident in their models that they leave no room for error or surprise. No room for things to be crazy, dumb, unexplainable, and to remain that way for a long time. Always asking “Why is this happening?” and expecting there to be a rational answer. Or worse, always mistaking what happened for what you think should have happened.
