leaders try to convince the world of their success in fighting al Qaeda, one member of the U.S. intelligence community would like to inform the public that we are, in fact, losing the war on terror. Further, until U.S. leaders recognize the errant path they have irresponsibly chosen, he says, our enemies will only grow stronger. According to the author Michael Scheuer, the greatest danger for Americans confronting the Islamist threat is to believe—at the urging of U.S. leaders—that Muslims attack us for what we are and what we think rather than for what we do. Blustering political rhetoric “informs” the public that the Islamists are offended by the Western world’s democratic freedoms, civil liberties, inter-mingling of genders, and separation of church and state. However, although aspects of the modern world may offend conservative Muslims, no Islamist leader has fomented jihad to destroy participatory democracy, for example, the national association of credit unions, or coed universities. Instead, a growing segment of the Islamic world strenuously disapproves of specific U.S. policies and their attendant military, political, and economic implications. Capitalizing on growing anti-U.S. animosity, Osama bin Laden’s genius lies not simply in calling for jihad, but in articulating a consistent and convincing case that Islam is under attack by America. Al Qaeda’s public statements condemn America’s protection of corrupt Muslim regimes, unqualified support for Israel, the occupation of Iraq and Afghanistan, and a further litany of real-world grievances. Bin Laden’s supporters thus identify their problem and believe their solution lies in war. Scheuer contends they will go to any length, not to destroy our secular, democratic way of life, but to deter what they view as specific attacks on their lands, their communities, and their religion. Unless U.S. leaders recognize this fact and adjust their policies abroad accordingly, even moderate Muslims will join the bin Laden camp.

    It has never been more important to understand extremism, yet the dictionary definition—a logical starting point in a search for understanding—tells us only that extremism is “the quality or state of being extreme.” In this volume in the MIT Press Essential Knowledge series, J. M. Berger offers a nuanced introduction to extremist movements, explaining what extremism is, how extremist ideologies are constructed, and why extremism can escalate into violence. Berger shows that although the ideological content of extremist movements varies widely, there are common structural elements.Berger, an expert on extremist movements and terrorism, explains that extremism arises from a perception of “us versus them,” intensified by the conviction that the success of “us” is inseparable from hostile acts against “them.” Extremism differs from ordinary unpleasantness—run-of-the-mill hatred and racism—by its sweeping rationalization of an insistence on violence. Berger illustrates his argument with case studies and examples from around the world and throughout history, from the destruction of Carthage by the Romans—often called “the first genocide”—to the apocalyptic jihadism of Al Qaeda, America's new “alt-right,” and the anti-Semitic conspiracy tract The Protocols of the Elders of Zion. He describes the evolution of identity movements, individual and group radicalization, and more. If we understand the causes of extremism, and the common elements of extremist movements, Berger says, we will be more effective in countering it.