This collection proposes a variety of explanations for the rationality of political extremism.

List of figures and tables; Introduction Albert Breton, Gianluigi Galeotti, Pierre Salmon, and Ronald Wintrobe; Part I. Extremism and Rationality: 1. The crippled epistemology of extremism Russell Hardin; 2. Leadership and passion in extremist politics Ronald Wintrobe; 3. Information control, loss of autonomy, and the emergence of political extremism Albert Breton and Silvana Dalmazzone; Part II. Extremism in Constitutional Democracies: 4. Extremism and monomania Pierre Salmon; 5. Some democratic propensities for extreme results Geoffrey Brennan; 6. Strategic positioning and campaigning Amihai Glazer; 7. At the outskirts of the constitution Gianluigi Galeotti; 8. Is democracy an antidote to extremism? Harold Hochman; Part III. Extremism in Non-Democratic Settings: 9. The political life cycle of extremist organizations Mario Ferrero; 10. Rationally violent tactics: evidence from modern Islamic fundamentalism Luisa Giurato and Maria Cristina Molinari; 11. De Bello Omniumi Contra Omnesj Guido Ortona; Index.