US Drone Strikes Tied to Fewer, Less-Lethal Terror Attacks in Pakistan

Why This Question Matters

Patrick B. Johnston and Anoop K. Sarbahi investigate a central debate in counterterrorism: do US drone strikes in Pakistan provoke “blowback” that increases Islamist terrorism, or do they disrupt violent networks and reduce attacks? The answer matters for U.S. foreign policy, civilian security in Pakistan, and scholarly claims about the political costs and benefits of targeted killings.

Do Drone Strikes Reduce Terrorism in Pakistan?

Johnston and Sarbahi evaluate the competing predictions of two theories. The blowback hypothesis predicts that strikes increase recruitment and eventually higher rates or deadliness of attacks; the disruption hypothesis predicts strikes degrade militants’ capacity and thereby reduce terrorist activity.

Detailed Strike and Attack Records (2007–2011)

The authors analyze temporally and geographically detailed data on US drone strikes and records of terrorist attacks in Pakistan from 2007 through 2011. Using statistical tests that link strike events to subsequent patterns of violence, they examine changes in both the incidence (how often attacks occur) and lethality (fatalities per attack), as well as shifts in tactical choices such as selective targeting of tribal elders.

Key Findings

• Drone strikes are associated with decreases in the incidence of terrorist attacks in the study period.
• Strikes are also associated with reductions in the lethality of attacks (fewer fatalities per attack).
• There is evidence of decreased selective targeting of tribal elders following strikes.
• The available data do not allow the authors to directly measure recruitment or long-term organizational resilience.
• The observed effects do not appear to persist indefinitely; the study does not find clear long-term reductions beyond the analyzed window.

Policy Implications and What This Means

The results lend some credence to the disruption argument: during 2007–2011, US drone strikes in Pakistan were associated with reduced frequency and deadliness of terrorist attacks. However, because recruitment dynamics and long-term effects cannot be assessed with the available data, the findings stop short of resolving whether strikes create longer-term security costs through backlash. Policymakers should weigh these short-term counterterrorism gains against political, legal, and humanitarian concerns that this analysis cannot fully address.