As for events in world history, the normalcy bias explains why, when the volcano Vesuvius erupted, the residents of Pompeii watched for hours without evacuating. It explains why thousands of people refused to leave New Orleans as Hurricane Katrina approached and why at least 70\% of 9/11 survivors spoke with others before leaving. Officials at the White Star Line made insufficient preparations to evacuate passengers on the Titanic and people refused evacuation orders  because they underestimated the odds of a worst-case scenario and minimized its potential impact. Similarly, experts connected with the Fukushima nuclear power plant were strongly convinced that a multiple reactor meltdown could never occur. Aftermath of Hurricane Katrina Normalcy bias, David McRaney has written, "is often factored into fatality predictions in everything from ship sinkings to stadium evacuations." Disaster movies, he adds, "get it all wrong. When you and others are warned of danger, you don ’ t evacuate immediately while screaming and flailing your arms." McRaney notes that in the book Big Weather, tornado chaser Mark Svenvold discusses "how contagious normalcy bias can be. He recalled how people often tried to convince him to chill out while fleeing from impending doom. Even when tornado warnings were issued, people assumed it was someone else's problem. Stake-holding peers, he said, would try to shame him into denial so they could remain calm. They didn't want him deflating their attempts at feeling normal".
As for events in world history, the normalcy bias can explain why, when the volcano Vesuvius erupted, the residents of Pompeii watched for hours without evacuating. It can explain why thousands of people refused to leave New Orleans as Hurricane Katrina approached and why at least 70\% of 9/11 survivors spoke with others before leaving. Officials at the White Star Line made insufficient preparations to evacuate passengers on the Titanic and people refused evacuation orders , possibly because they underestimated the odds of a worst-case scenario and minimized its potential impact. Similarly, experts connected with the Fukushima nuclear power plant were strongly convinced that a multiple reactor meltdown could never occur. Aftermath of Hurricane Katrina Normalcy bias, David McRaney has written, "is often factored into fatality predictions in everything from ship sinkings to stadium evacuations." Disaster movies, he adds, "get it all wrong. When you and others are warned of danger, you don ' t evacuate immediately while screaming and flailing your arms." McRaney notes that in the book Big Weather, tornado chaser Mark Svenvold discusses "how contagious normalcy bias can be. He recalled how people often tried to convince him to chill out while fleeing from impending doom. Even when tornado warnings were issued, people assumed it was someone else's problem. Stake-holding peers, he said, would try to shame him into denial so they could remain calm. They didn't want him deflating their attempts at feeling normal".
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