A key argument of Chace is that much this military involvement stems from a logic of US paranoia in reaction to the Cuban Revolution. A similar argument is put forward by David Keen, political economist and Professor of Complex Emergencies at the London School of Economics. His book "Endless War? Hidden Function of the 'War on Terror (2006) argues that the United States' strategies and tactics in the War on Terror use a "militaristic state-cased framework". This framework, though "counterproductive", has an "inner logic" and a "psychological function" of responding to the trauma of September 11 attacks.