Britain escaped another terrorist bombing. It was pure luck; an ambulance crew noticed the working bomb in a vehicle when they were at a nightclub helping a patron. These near misses and foiled attacks–ranging from plots to blow up apartment buildings to designs on the gas lines at JFK Airport to shooting up Fort Dix to the shoe bomber–are out of the news so fast it boggles the mind.

Yet these foiled attacks are very important. And this heuristic of ignoring “near misses” impedes clear thinking and good policy. These attacks show we’re still at war. They show the enemy means business. They show us how easily an attack can happen and how much must happen right among law enforcement to thwart any attack. They show how many lives can be lost in an instant if al Qaeda is successful. And they also show the importance of good intelligence, which is often too hard to come by using ordinary law enforcement means.

Why the difference? Ordinary criminals often operate alone or in small groups. The stakes of many of their crimes are low. The violence they commit is frequently restricted to other criminals in those instances where large organizations are involved. And, when ordinary innocent Americans can get caught up in the dragnet, this means a high costs of mistakes. In contrast, terrorists operate in large groups and their associated cells. The stakes of success are very high, usually involving mass death to ordinary Americans. And a great many of these suspects are foreigners overseas (and illegal aliens at home) to whom lower duties of civil liberties protection are owed. After all, in a healthy society it should not be controversial to say that a national government is, above all, dedicated to the interests and protection of its citizens.

Sadly, the Michael Moores of the world feel free saying we’re not too endangered by terrorism and that the threat is overblown. The only way this naive blowhard can make such a claim is by willfully ignoring the various foiled attacks that al Qaeda has launched since 9/11. The illogic of only looking at successful attacks has no parallel in any other area of life where risk management is called for, whether we’re talking about investing or insurance or the law of criminal attempt liability or medicine. Perhaps there is some deep evolutionary reason for this widespread “availability heuristic,” but self-described sophisticates in the media and the government should know better.