An informative excerpt from the scholared Daniel Pipes:
Mohammed Salameh, the terrorist who returned to the rental agency in 1993 to retrieve the $400 deposit he had paid on a truck subsequently used to blow up the World Trade Center. His penny-pinching lead to his own capture and that of several other bombers.
Zacarias Moussaoui, thought to have been the would-be 20th hijacker of the September 11, 2001, attacks, was sitting in jail on that date because his disheveled and impoverished appearance at a flight instruction school was so discordant (“there’s really something wrong with this guy”) that two of its staff phoned the FBI. In April 2005, Moussaoui pleaded guilty to six counts of conspiracy to commit terrorism.
Michael Wagner, an African-American convert to Islam associated with Al-Qaeda, did not wear a seat belt and that got him stopped by the police in July 2004 near Council Bluffs, Iowa. His car contained “flight training manuals and a simulator, documents in Arabic, bulletproof vests and night-vision goggles, a night-vision scope for a rifle, a telescope, a 9mm semiautomatic pistol and hundreds of rounds of ammunition.”
Zaynab Khadr, accused by Canadian authorities of having “willingly participated and contributed both directly and indirectly towards enhancing the ability of Al Qaeda to facilitate its criminal activities,” returned to Canada in February with a computer chock full of documents that the authorities say “provide insights into the tactics, techniques and procedures” of Al-Qaeda and other groups.
Sami Ibrahim Isa Abdel Hadi, 39, was stopped in May for tailgating in Ridgefield Park, N.J. When a police officer called in Abdel Hadi’s North Carolina license plates, he learned that Abdel Hadi had been ordered deported to Brazil in December 2001 and is listed in the FBI’s National Crime Information Center database. Even more alarmingly, he had a valid temporary identity card permitting him to paint the George Washington Bridge (a high-profile potential terrorist target).
When an accused Los Angeles terror gang, the Assembly of Authentic Islam, needed money for arms, it robbed gas stations rather than obtain funds legally. One of its holdup artists dropped a mobile phone during a June robbery, which the police retrieved and used to unravel the plot and arrest the conspirators.
Other famous dumb terrorists include Yu Kikumura, a member of the Japanese Red Army whose odd behavior prompted a search of his car at a New Jersey Turnpike rest stop in April 1988, turning up three powerful bombs. Or Timothy McVeigh, apprehended in April 1995 after bombing the Oklahoma City federal building that killed 168 people, because his car lacked a license plate.
Counterterrorism is a difficult business, so it is fortunate that terrorists often act dumb.