Mistakes Were Made (But Not by Me): Why We Justify Foolish Beliefs, Bad Decisions, and Hurtful Acts: Summary & Key Insights

Cognitive dissonance begins with conflict—the mental tension of holding contradictory beliefs or behaving against our values. When Leon Festinger first studied this phenomenon in the 1950s, he discovered that people would go to extraordinary lengths to justify beliefs proven false. Elliot and I begin by showing that this drive for consistency is not a flaw but a fundamental feature of how the human mind maintains self-coherence. We want to believe we are sensible, moral, and intelligent; any evidence to the contrary threatens that image. To reduce the dissonance, we adjust the facts.

Imagine a smoker who knows cigarettes cause cancer yet continues to smoke. “Sure, smoking is bad,” he says, “but my grandmother lived to ninety.” The smoker isn’t deceiving others—he’s soothing a painful contradiction within himself. Self-justification operates like an emotional thermostat, restoring mental balance even if it falsifies reality. In this first section, we explain how dissonance drives countless everyday decisions—from small justifications after minor mistakes to grand rationalizations that sustain systemic injustice.

We reveal how self-justification shapes character. People don’t set out to be corrupt or cruel; rather, they start by defending one small inconsistency, and then another, until gradually their moral compass has shifted. Recognizing this mechanism is the first step to reclaiming agency. When you grasp that self-justification isn’t just defense but an active rewriting of reality, you begin to see how profoundly it influences memory, identity, and belief.

Memory, we argue, is not a recording device but a storytelling process. When people look back, their recollections are subtly edited to fit the narrative that sustains their self-image. You forget the insult you gave, but remember vividly the one you received; you exaggerate your foresight in success and minimize responsibility in failure. Neuroscience confirms this selective reconstruction: each time we recall an event, we modify it slightly, bringing it closer to what we wish had occurred.

In the book, we share studies showing how witnesses, jurors, and even therapists unconsciously alter memory to align with self-protective explanations. This process happens automatically, not maliciously. Once people have committed to an interpretation—“I am fair,” “I did the right thing”—their brains rewrite experiences that threaten that conviction. Such memories become emotionally sealed, resistant to correction. This is why arguments over shared histories are so intractable: two people are defending different constructions of reality.

By understanding memory as a flexible instrument of self-justification, we gain compassion for human inconsistency. Instead of condemning false recollection, we can ask what purpose it serves. When the purpose is self-protection, awareness is the remedy. The more mindful we become of how memory is shaped by pride and pain, the closer we approach truth.