former united states secretary of state warren christopher has said that terrorist acts in the name of religion and ethnic identity have become "one of the most important security challenges we face in the wake of the cold war." however, the political scientists robert pape and terry nardin, the social psychologists m. brooke rogers and colleagues, and the sociologist and religious studies scholar mark juergensmeyer have all argued that religion should only be considered one incidental factor and that such terrorism is primarily geopolitical.