Research results

Who Will Become a Terrorist? Research Yields Few Clues

The brothers who carried out suicide bombings inBrussels last week had long, violent criminal records and had been regarded internationally as potential terrorists. But in San Bernardino, Calif., last year, one of the attackers was a county health inspector who lived a life of apparent suburban normality.

And then there are the dozens of other young American men and women who have been arrested over the past year for trying to help the Islamic State. Their backgrounds are so diverse that they defy a single profile.

What turns people toward violence — and whether they can be steered away from it — are questions that have bedeviled governments around the world for generations. Those questions have taken on fresh urgency with the rise of the Islamic State and the string of attacks in Europe and the United States. Despite millions of dollars of government-sponsored research, and a much-publicized White House pledge to find answers, there is still nothing close to a consensus on why someone becomes a terrorist.