Mistakes Were Made (But Not by Me)

The verdict

Mistakes Were Made (But Not by Me) is one of the most important books on human irrationality that most people have not read. While Thinking, Fast and Slow gets the attention, Tavris and Aronson’s book addresses something even more consequential: why intelligent, well-meaning people cannot admit they are wrong, and how this failure cascades into catastrophic outcomes in law, medicine, politics, and personal relationships.

The mechanism is cognitive dissonance — the psychological discomfort that arises when your behavior contradicts your self-concept. Rather than changing the self-concept (which is psychologically expensive), the brain resolves the dissonance by rewriting the narrative. You did not make a mistake; the situation was different. You were not wrong; you were right for reasons you had not fully articulated yet. The evidence against your position is flawed; the evidence supporting it is strong.

This is not lying. It is something more insidious: genuine, unconscious self-deception that feels like honest reasoning.

The pyramid of choice

The book’s most powerful concept is the pyramid of choice. Imagine two people standing at the top of a pyramid, facing an ambiguous ethical decision. They are essentially identical in their values and beliefs. One makes a slightly questionable choice; the other makes a slightly more cautious one. From that point, cognitive dissonance drives them in opposite directions.

The person who made the questionable choice must justify it — “it was not that bad, everyone does it, the rules are unfair” — which makes the next questionable choice easier to justify, which requires further self-justification, and so on. The cautious person goes through the inverse process, becoming increasingly certain that the questionable behavior is wrong. By the time they reach the bottom of the pyramid, they are in completely different moral positions, each confident that they arrived there through honest reasoning.

This model explains how good people do terrible things incrementally. No one wakes up and decides to commit fraud, abuse power, or destroy evidence. They take one small step, justify it, take another, justify it, and eventually find themselves in a position that would have horrified their earlier selves — but by then, the chain of self-justification has rewritten the entire narrative.

Memory as self-justification

Tavris and Aronson devote a devastating chapter to memory distortion. Memory is not a video recording. It is a reconstruction, and the reconstruction process is heavily influenced by current beliefs, motivations, and self-image. You do not remember what happened; you remember a version of what happened that supports who you believe yourself to be now.

This means that when you argue with someone about what happened in a past conversation, you are both likely wrong — and both likely confident. Each person has reconstructed the memory to support their version of events. The argument is not about facts but about competing self-justifications, which is why such arguments are almost impossible to resolve through logic alone.

The implications for eyewitness testimony are chilling. Tavris and Aronson document case after case where confident eyewitnesses identified the wrong person, and where their confidence increased over time even as the original memory degraded. The brain does not flag uncertainty in memories — it smooths it over, filling gaps with plausible details that feel like genuine recollections.

Self-justification in institutions

The book’s most disturbing chapters apply cognitive dissonance to institutional failures. Prosecutors who have secured wrongful convictions resist new evidence because admitting error threatens their identity as champions of justice. Therapists who have implanted false memories in patients cannot acknowledge the harm because it contradicts their self-image as healers. Doctors who make diagnostic errors double down rather than reconsider because the alternative — admitting that their judgment harmed a patient — is psychologically unbearable.

In each case, the problem is not malice. It is the ordinary operation of cognitive dissonance in people who are deeply invested in seeing themselves as competent and ethical. The more competent and ethical you believe yourself to be, the harder it is to acknowledge specific instances where you were neither.

Relationships and the dissonance trap

The chapter on relationships is quietly devastating. Tavris and Aronson show how cognitive dissonance operates in marriages, friendships, and partnerships to escalate minor conflicts into permanent rifts. Each partner justifies their own behavior while interpreting the other’s behavior in the worst possible light. Over time, the accumulated self-justifications create a narrative in which one partner is reasonable and the other is impossible — a narrative that both partners hold simultaneously about the other.

The antidote is simple to describe and extraordinarily difficult to practice: the willingness to say “I was wrong” without qualification, without but, without redirecting blame. This single capacity, more than any communication technique, determines whether a relationship can survive conflict.

Read this if…

You want to understand why people — including you — cannot admit mistakes, and how this failure drives escalation in conflicts, relationships, and institutions. This book is essential for anyone in a position of authority (managers, judges, doctors, teachers) where the inability to acknowledge error has consequences beyond the self.

Skip this if…

You want techniques for overcoming cognitive dissonance in yourself. The book is excellent at describing the problem and illustrating it with compelling examples but relatively thin on practical strategies for change. Pair it with Julia Galef’s The Scout Mindset for the prescriptive companion piece.

Start here

Read Chapter 1 for the cognitive dissonance framework and the pyramid of choice. Then read Chapter 4 on memory distortion and Chapter 7 on relationships. These three chapters contain the ideas with the widest applicability to daily life.