Reassessing the realities of terrorism

Professors John Mueller & Mark G. Stewart believe that the threat of terrorism is Hardly Existential:

...[A]nnual terrorism fatality risks, particularly for areas outside of war zones, are less than one in one million and therefore generally lie within the range regulators deem safe or acceptable, requiring no further regulations, particularly those likely to be expensive. They are similar to the risks of using home appliances (200 deaths per year in the United States) or of commercial aviation (103 deaths per year). Compared with dying at the hands of a terrorist, Americans are twice as likely to perish in a natural disaster and nearly a thousand times more likely to be killed in some type of accident. The same general conclusion holds when the full damage inflicted by terrorists -- not only the loss of life but direct and indirect economic costs -- is aggregated. As a hazard, terrorism, at least outside of war zones, does not inflict enough damage to justify substantially increasing expenditures to deal with it.

Because they are so blatantly intentional, deaths resulting from terrorism do, of course, arouse special emotions. And they often have wide political ramifications, as citizens demand that politicians "do something." Many people therefore consider them more significant and more painful to endure than deaths by other causes. But quite a few dangers, particularly ones concerning pollution and nuclear power plants, also stir considerable political and emotional feelings, and these have been taken into account by regulators when devising their assessments of risk acceptability. Moreover, the table also includes another kind of hazard that arouses strong emotions and is intentional -- homicide -- and its frequency generally registers, unlike terrorism, in the unacceptable category.