A SECRET FBI STUDY found that anger over U.S. military operations abroad was the most commonly cited motivation for individuals involved in cases of “homegrown” terrorism. The report also identified no coherent pattern to “radicalization,” concluding that it remained near impossible to predict future violent acts.

The study, reviewed by The Intercept, was conducted in 2012 by a unit in the FBI’s counterterrorism division and surveyed intelligence analysts and FBI special agents across the United States who were responsible for nearly 200 cases, both open and closed, involving “homegrown violent extremists.” The survey responses reinforced the FBI’s conclusion that…