The French Middle Eastern scholar Olivier Roy has pointed out that many recent terrorists, such as those who staged the Bataclan attacks in Paris in 2015, have a similar background: they are second-generation European Muslims who have rejected the Islam of their parents. (About 25 percent of the new generation of jihadis are converts to Islam with personal stories similar to those of jihadis who were born Muslim.)7 In their early years they appeared to be westernized, drinking alcohol and smoking weed, dating girls, watching sports, and otherwise seeming to fit into their surroundings. Yet
  
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