They note that the lone wolf terrorist who killed the highest number of victims was Joseph Paul Franklin who carried out a series of attacks in which he targeted black and Jewish Americans.

[1] While overall calling the book meticulous and praising it as a valuable resource, James Mills criticizes Hamm and Spaaij for using narrow criteria that eliminate lone wolf pairs such as Rizwan Farook and Tashfeen Malik and the Tsarnaev brothers from inclusion on their list, even though they meet the definition in all other ways.

[4] Book reviewer Kris Millett praises their "devastatingly effective" use of data to "argue that those captured in the sting operations did not display the personal characteristics common to the radicalisation of lone wolf terrorists.

"[3] Reviewer Joshua Sinai points out that lone wolves may regard themselves as members of terrorist organizations on the grounds that they are carrying out orders broadcast on the internet by the leaders of such organizations, and argues that, pace Hamm and Spaaij, FBI "sting" operations have been effective in preventing terrorism, but praises the author's six-part model (p. 159 in book) of personal and political grievance, affinity with online sympathizers or an extremist group, enabler, broadcasting intent, triggering event, and engaging in terrorism (p. 159).

[5] According to a review in Times Higher Education that described The Age of Lone Wolf Terrorism as an "genuinely indispensable study of today's steadily increasing terrorist threat," the book's "pivotal contention" that the radicalization of lone wolf terrorists exhibits discernible patterns that include "the integration of personal and political grievances; an affinity with online sympathizers and/or extremist groups," and "triggering events that, oftentimes, cause a dramatic change in behavior".