The security professions need to learn a lesson which doctors have understood for some time now: treating everyone for a rare threat does more harm than good.
Suppose there is a drug which prevents heart attacks, but due to side effects, rare reactions, or just plain error, causes damage to a small proportion of people. If you have a 50% chance of a heart attack, taking it would be a good bet. But giving the same drug to everyone would be a medical disaster.
Any treatment you give to a broad population had better be extraordinarily safe. The rarer the threat you are trying to address, the more easily you can do more harm than good.
Suppose there is a drug which prevents heart attacks, but due to side effects, rare reactions, or just plain error, causes damage to a small proportion of people. If you have a 50% chance of a heart attack, taking it would be a good bet. But giving the same drug to everyone would be a medical disaster. Any treatment you give to a broad population had better be extraordinarily safe. The rarer the threat you are trying to address, the more easily you can do more harm than good.
Terrorism is rare.