For the very same reason that Christians slaughtered 600,000 muslims in Bosnia, or scores of muslim Albanians in Kossovo. The same reason for which the Jewish Israeli army bombed a shelter full of innocent civilians in Southern Lebanon. The reason is: many people are too stupid to understand their religion (or lackthereof in the case of atheists!).
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Name : Karim, Gender : M, Age : 23, City : Los Angeles, State : CA, Country : United States, Social class : Middle class,