In 2004, Dutch filmmaker Theo van Gogh was brutally murdered on a busy Amsterdam street. His killer was Mohammed Bouyeri, a twenty-six-year-old Dutch Moroccan offended by van Gogh's controversial film about Muslim suppression of women. The Dutch government had funded separate schools, housing projects, broadcast media, and community organizations for Muslim immigrants, all under the umbrella of multiculturalism. But the reality of terrorism and radicalization...