BANGLADESH, Dec. 2 -- In the years since the 9/11 attacks, the individual perpetrators of these and similar crimes have scarcely been studied although, since July 2015 alone, Islamists have murdered at least 92 people in the United States. Many others have been convicted-or are being prosecuted-for joining or trying to join the self-named Islamic State (ISIS). Analysis of all mass murderers' motivations, ideologies, and radicalization is crucial, but it has been neglected for offenders claiming to act in the name of Islam. However, a data-rich study by sociology professor Charles Kurzman of the University of North Carolina at Chapel Hill offers a window into Islamist terrorist radicalization.

Overlooking Islamic Radicalization

Understandi...