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People who are highly practiced at avoiding embarrassment and threat produce, automatically and without effort, exactly the behavior that keeps problems from being solved. The incompetence is skilled because it is smooth, tacit and hard to see as a choice, so the more competent someone is at tactful evasion, the more reliably they create the outcomes they say they do not want.
A defensive routine is any policy or action that stops individuals or the organization from feeling embarrassment or threat, and in doing so also stops them from finding and reducing the causes of that threat. These routines are anti-learning and overprotective, and they persist because everyone takes part in them while each person blames the system or someone else for them.
The routine follows fixed rules: craft a mixed message, act as if it is not mixed, make both the mixed message and its inconsistency undiscussable, then make the undiscussability itself undiscussable. That final layer seals the loop, because it prohibits the very conversation that could expose and correct the pattern.
What people say guides their action (espoused theory) often differs systematically from the rules their behavior actually follows (theory-in-use), and they are usually unaware of the gap. To diagnose a defensive pattern, infer the governing rules from what people actually say and do, for example from recorded conversations, and not from their descriptions of themselves.
The dominant theory-in-use, Model I, tells people to stay in unilateral control, maximize winning, suppress negative feelings, and act rationally, all while keeping their reasoning private and untested. This produces defensive, self-sealing reasoning in which conclusions are never exposed to disconfirmation, so defensive routines emerge from ordinary competent behavior rather than from bad people.
Model II swaps the governing values for valid information, free and informed choice, and internal commitment, and pairs advocacy with inquiry: state your view, show the data and inferences behind it, and invite others to test it. To break a defensive routine you name the undiscussable and the fact that it was undiscussable, and you do it in the moment and in public so the reasoning can be examined.