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CAUGHT up in a large-scale tragedy such as a terrorist attack or earthquake, most people lose their heads and panic. Disorder reigns and social responsibility breaks down. That, at least, is the view of many governments and emergency planners, who prepare for disasters presuming that people will throw rationality to the wind.

Both the UK’s draft Civil Contingencies Bill, which aims to increase the government’s powers to deal with major catastrophes, and the Homeland Security Act in the US, with its “command and control” model of dealing with terrorist attacks, discount any helpful contribution from the public. Instead, they rely on top-down approaches run by technocrats…

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