That's kind of the problem, Islamic Terrorists are in a very middle ages mindset and broadly fail to recognise that. The majority of the Western world has been at least quasi-democratic for around 2 or 3 centuries, extreme religous values and acting violently to defend ones faith has been slowly phased out as the countries, economies and societies evolve. In many parts of the world where Islam is prevelent the country and society has not been through the stabilising processes that have resulted in democracy, the rule of law and religious and cultural tolerance in the West. These countries and societies are still in a state of material and social deprevation, tribal tendencies and extreme religious vigilantes have not yet been phased out by progression of society; people believe all knowledge is contained in one book, the Koran, much as western people did in the middle ages with the Bible. And also as Western people did in the middle ages they feel duty bound to uphold their family, country and religious against outside influences as much as possible; this kind of enviroment means greivences are haboured for many decades as children inherit a sense of who on their side and who isn't from their parents. Interestingly, crusades have already been mentioned in this thread, in the kind of enviroment I have described it is entirely possible that many Islamists still hate the West over the events of centuries ago.

In Europe, Oriental usually refers to the inhaibitants of South East Asia.