American University’s Tricia Bacon and Georgetown University’s Elizabeth Grimm Arsenault have a new article in Studies in Conflict and Terrorism journal on the break between Al Qaeda and Islamic State. The article’s abstract:
Employing counterfactuals to assess individual and systemic explanations for the split between al Qaeda and the Islamic State of Iraq and al-Sham (ISIS), this article concludes that individual leaders factor greatly into terrorist alliance outcomes. Osama bin Laden was instrumental in keeping al Qaeda and ISIS allied as he prioritized unity and handled internal disputes more deftly than his successor, Dr. Ayman al-Zawahiri. Although a troubled alliance, strategic differences between al Qaeda and ISIS were not sufficient to cause the split. Rather, the capabilities of al Qaeda’s leader determined the group’s ability to prevent alliance ruptures.
The article is an interesting use of the counterfactual method for causal inference of explanations. The authors’ focus on Dr Ayman al-Zawahiri contrasts with other explanations such as Will McCants’ focus on Islamic State’s apocalyptic belief system.