Complex problems have simple, easy to understand wrong answers. The bigger they are, the harder they hit. For every action, there is an equal and opposite criticism. In every organization there will always be one person who knows what is going on. Consultants are mystical people who ask a company for a number and give it back to them.
Hot glass looks exactly the same as cold glass.
If it's green or it wiggles, it's biology. If it stinks, it's chemistry. If it doesn't work, it's physics. To err is human, but to really foul things up requires a computer. People who love sausage and respect the law should never watch either one being made.