
Even when by happenstance the United States does what a terrorist organization had requested, Washington cannot admit it. In April 2003, the United States began withdrawing its military forces from Saudi Arabia -- the central demand of Osama Bin Laden's 1996 fatwa: "Declaration of War against the Americans Occupying the Land of the Two Holy Places." The removal of most U.S. servicemembers from Saudi Arabia -- there were 4,000 there in 2003, and 278 today -- was presented as the inevitable winding-down of the Iraqi war and no-fly-zones. However, a senior U.S. defense official expressed concern at the time "that it not look as if it's precipitous, because it will look like bin Laden won." Demonstrating resolve is mandatory even when implementing long-planned military-basing decisions.
Third, since there can be a multiplicity of motivations, knowing "why" does not lend itself to easy policy responses. In May 2010, Faisal Shahzad -- a Pakistani immigrant who moved to the United States in 1999 and became a citizen in 2009 -- tried to detonate an SUV packed with explosives in Times Square. In a videotape recorded before the failed attack, Shahzad declared it "will be a revenge for all the mujahedeen and oppressed Muslims." He later reportedly told investigators "that he was upset over repeated CIA drone attacks on militants in Pakistan." (He received explosives training from the Pakistani Taliban in the Waziristan region in late 2009.) Still another analysis determined that Shahzad was ultimately inspired by the Pakistani security forces storming of the Red Mosque in Islamabad that was held by armed militants in July 2007.
Were these motivations examples of "blowback" indicating that the CIA should refrain from drone strikes, or evidence that more strikes were needed to kill more Pakistan Taliban members? (Unsurprisingly, the latter occurred.) Or, has the Pakistani government subsequently reduced its long-standing practice of using brutal force and conducting extrajudicial killings during its counterinsurgency operations? (The just-released State Department Country Reports on Human Rights Practices' Pakistan chapter says "no.")
Fourth, categorizing groups that are responsible for terrorist attacks is different from knowing their motivations. An October 2010 study of 86 foiled and executed terrorist plots against U.S. targets from 1999 to 2009 identified 10 distinct ideologies: left, right, anti-Muslim, animal rights, anti-abortion, militia/anti-government, al Qaeda and allied movements (AQAM), AQAM-inspired, white supremacist, and unknown/non-ideological. Of the 86 plots, 40 were undertaken by AQAM or AQAM-inspired groups, 32 by white supremacist and militia groups, and only three were classified as unknown. Being conscious of the groups most responsible for recent terrorist plots helps law enforcement officials prioritize their preventive efforts. Yet, in so much as we could assign the Tsarnaev brothers to one of these groups (we cannot yet), membership is not necessarily motivation, since individuals may align themselves with terrorist organizations, but never conduct or provide material support for acts of terrorism.
There is inadequate information to guess why the Tsarnaev brothers did what they did. Since answering this question is inherently difficult if not impossible, and will not compel any substantive public policy changes, what then is our motivation to understand terrorists' motivations? Ultimately, the who, what, when, where, and how of aberrant behavior catches our interest, but the why is what captivates and draws us in. Without some clear animating impulse to explain evil, the story line is mechanical and impersonal, unsatisfying and incomplete. Given the inherent uncertainty in understanding the Tsarnaev brothers' actions, at a minimum we should refrain from undertaking policy changes based upon whatever perceived motivations we come up with.

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