In Leaderless Jihad, Sageman rejects the views that place responsibility for terrorism on society or a flawed, predisposed individual. Instead, he argues, the individual, outside influence, and group dynamics come together in a four-step process through which Muslim youth become radicalized. First, traumatic events either experienced personally or learned about indirectly spark moral outrage. Individuals interpret this outrage through a specific ideology, more felt and understood than based on doctrine. Usually in a chat room or other Internet-based venues, adherents share this moral outrage, which resonates with the personal experiences of others. The outrage is acted on by a group, either online or offline.
Leaderless Jihad offers a ray of hope. Drawing on historical analogies, Sageman argues that the zeal of jihadism is self-terminating; eventually its followers will turn away from violence as a means of expressing their discontent. The book concludes with Sageman's recommendations for the application of his research to counterterrorism law enforcement efforts.