Fear can be a constructive emotion. When we worry about a risk, we pay more attention to it and take action where warranted. Fear keeps us alive and thriving. It’s no exaggeration to say that our species owes its very existence to fear. But “unreasoning fear” is another matter. It was unreasoning fear that could have destroyed the United States in the Great Depression. It was unreasoning fear that killed 1,595 people by convincing them to abandon planes for cars after the September 11 attacks. And it is the growing presence of unreasoning fear in all the countries of the Western world that is
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