Conventional wisdom says that none of us is safe from terrorism. The truth is that almost all of us are. In most years allergic reactions to peanuts, deer in the road and lightning have all killed about the same number of Americans as terrorism. In 2001, their banner year, terrorists killed...one fifteenth the number killed by car accidents. And if something far worse than Sept. 11 does occur, the country will recover. A disaster of biblical proportions visited New Orleans. The Republic has not crumbled. The terrorist risk to the United States is serious, but far from existential. Human psychology leads us to overestimate the likelihood of dangers that are novel and uncontrollable. The news media and social interaction reinforce these common errors. People overestimate terrorism's risk and demand excessive protection from it. From government bureaucrats seeking larger budgets, to contractors hawking technology, to congressmen campaigning, danger sells. It delivers money and votes. It also sells newspapers. Careerist think tank and academic analysts learn that grants, invitations to Capitol Hill and jobs are more likely to go to those who trumpet threats and defenses against them than those who tell Americans to worry less. America tends to exaggerate national security dangers. Victory is persuading...regular Americans not to be afraid. Conventional pundits of homeland security worry that the public will become complacent. We should worry that it won't.