Compare modern day "extremism" to the ancient crusades. Then, European superpowers funded an army to go to war and attempt to spread their religion violently. Now, a bunch of dudes in flip flops have to hijack vehicles or target large, crowded events in order to manage anything newsworthy. It is still abhorrent to murder people in the modern day over religious issues, but it isn't funded by legitimate governments as often anymore. I mean, the crusades, a much larger scale conflict, was not even considered extreme by anyone! No one argued that "real christians" don't crusade, but it is true that many modern muslims are very against extremism