Researchers have estimated that the 9/11 attacks generated nearly 2,200 additional road traffic deaths in the United States through mid-2003 from a relative increase in driving and reduction in flying resulting from fear of additional terrorist attacks and associated reductions in the convenience of flying.
As Henry Hazlitt used to say, good economics demands considering all the consequences for all groups of people. This is true for every issue that has economic consequences. The failure to do so adequately results in security systems that make us less secure, job creation programs that destroy jobs, and environmental protection actions that harm the environment. Sadly, the list goes on and on.