Thinking that we have supernatural powers can cause difficulties. Take mind reading for example. There is only one way to be sure that you have understood another person correctly. However well you know them, you can't read their mind, so check before acting. The problem is compounded when your relationship is long-standing; your partner invariably thinks they know what you mean, and vice-versa. It's not the exchange of information that is the problem, it's that we believe we know what it means.
Have you ever wondered why so many instructions fail? It's often because they are not instructions at all, but an expression of the speakers own apprehensions. Without knowing it, when you start the sentence with "Don't..." you are inviting the receiver to do what follows.