Why Good People Make Bad Decisions in a Crisis

Security procedures assume people will think rationally under pressure. But stress changes how the brain processes information, making human behavior one of the most overlooked factors in crisis preparedness.

Key Highlights

  • Crisis doesn't eliminate training. It changes how people think, making conditioned behavior more likely than deliberate analysis.

  • Organizations build resilience by preparing people for uncertainty, not simply by adding more procedures or checklists.

  • As AI-powered deception grows more convincing, understanding human behavior becomes as critical as strengthening technology.

Every security organization invests in procedures. Policies are written, training is delivered and exercises are conducted with the expectation that when a crisis unfolds, people will respond as they’ve been taught.

Reality is rarely that predictable.

When fear, urgency and uncertainty collide, the brain doesn’t always behave the way procedures assume it will. People who know exactly what they’re supposed to do may hesitate, freeze, follow the wrong person or make decisions that seem irrational once the crisis has passed. Those responses aren’t necessarily signs of poor training or weak leadership. They are often the result of how the human brain responds under acute stress.

This second installment in my five-part series examines a question at the heart of crisis management: Why do people fail to follow procedures when those procedures matter most? The answer challenges many of our long-held assumptions about training, leadership and the belief that we remain in control when pressure is at its greatest.

Why rational thinking breaks down under stress

Most security procedures are built on the simple assumption that people will behave rationally under pressure.

They’ll recall their training, follow steps in order, communicate clearly, wait for authorization to act, then act in alignment with policy and institutional goals, just as outlined in the organization’s standard operating procedures (SOPs). In calm environments, this assumption mostly holds. In crises, it collapses. Completely. Not because people are careless or incompetent, but because stress changes the chemical makeup and communication pathways in the brain, well before it changes behavior.

Under acute stress, the nervous system shifts into survival mode. Blood flow prioritizes large muscle groups over fine motor control. Focus narrows. Memory retrieval becomes unreliable, if not outright impossible. Time perception distorts.

This isn’t psychology in the abstract. It’s biology.

When stress takes the wheel, the prefrontal cortex, which governs deliberate thinking and decision-making, becomes less influential. The brain increasingly relies on learned habits, instinctive threat responses and emotionally driven social cues.

Which means that in a crisis, people don’t execute procedures. Behavior becomes guided more by conditioning than deliberate analysis.

About the Author

Frazer Thompson

Vice President of Operations at PIER 39

Dr. Frazer G. Thompson is Vice President of Operations at PIER 39 in San Francisco, where he oversees operational readiness and security integration for a public-facing destination that welcomes more than 11 million visitors annually. A senior attractions operations executive and crisis consultant, he has nearly 30 years of experience in high-pressure environments, including leadership roles with Disney and Universal Studios. His work focuses on crisis management, human behavior, resilience, and decision-making under stress. Thompson has contributed to Joint Counterterrorism Assessment Team (JCAT) publications and is the author of "Edge of Calm: Leadership and Crowd Psychology During a Crisis."

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