The truth is that although many commentators on 9/11 called the attacks “our Pearl Harbor,” a better comparison might be our Trojan Horse — a stratagem so successful, so devastating, and so infamous that it will never work again. It makes little sense for the TSA to organize itself so single-mindedly against an attack that may never come, a massive agency on the lookout for a big, wooden horse. 

Source: The Humiliating History of the TSA