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Some years ago, I got a call from an analyst at the National Counterterrorism Center. After yet another gruesome mass shooting (this time, it was Dylann Roof’s attack on a Bible-study group at a Black church in Charleston, South Carolina, that killed nine and wounded one), I had written an article about the young men who perpetrate such crimes. I suggested that an overview of these killers showed them, in general, to be young losers who failed to mature, and whose lives revolved around various grievances, insecurities, and heroic fantasies. I called them “Lost Boys” as a nod to their arrested adolescence.

The NCTC called me because they had a working group on “countering violent extremism.” They had read my article and they, too, were interested in the problem of these otherwise-unremarkable boys and young men who, seemingly out of nowhere, lash out at society in various ways. We think you’re on to something, the analyst told me. He invited me to come down to Washington and discuss it with him and his colleagues.

The meeting was held in a classified environment so that the group’s members, representing multiple intelligence and law-enforcement agencies, could more easily share ideas and information. (I was a government employee at the time and held a clearance.) But we could have met in a busy restaurant for all it mattered—the commonalities among these young men, even across nations and cultures, are hardly a secret. They are man-boys who maintain a teenager’s sharp sense of self-absorbed grievance long after adolescence; they exhibit a combination of childish insecurity and lethally bold arrogance; they are sexually and socially insecure. Perhaps most dangerous, they go almost unnoticed until they explode. Some of them open fire on their schools or other institutions; others become Islamic radicals; yet others embrace right-wing-extremist conspiracies.

I emerged from the meeting with a lot of interesting puzzle pieces but no answers. Since then, there have been more such attacks, more bodies, more grief—but precious little progress on preventing such incidents. A few recent examples: In 2021, a 15-year-old boy murdered four of his fellow students in his Michigan high school.