Terrorism Works, for its Supporters

Empirical studies have shown that terrorists’ policy goals are rarely achieved, leading some to conclude that terrorism doesn’t work. We theorize that terrorism can work, but for its supporters rather than for the terrorists themselves. Because supporters are willing to contribute resources to a terrorist organization, thereby increasing the organization’s ability to launch attacks, this can coerce the targeted government to revise its policies in accordance with the supporters’ preferences. Targeted governments may respond with concessions in order to erode support and thereby render the terrorists easier to defeat. Support can be rational even when supporters’ ideal policies are closer to those of the government than to those of the terrorists. We examine Hamas and the Provisional IRA, generally regarded as failures. We show that targeted governments sometimes made concessions that placated supporters but not the terrorists, and that this was followed by reduced support for and occurrence of violence.