Morality in Terrorist Organizations

From the perspective of the United States, terrorist organizations in Middle East act in ways that contradict morality in international politics.   Questions raised about morality:1) How to terrorists justify the killing of innocent people in the name of their religion when the Quran does not preach murder or violence? 2) Why do terrorists claim that western influences are corrupting their culture, yet cities such as Dubai and Beirut have become westernized on their own and still retain their national identity?3) What is moral about the Al Queda suppressing their fellow Afghan people? Through their immoral acts, terrorist organizations are hindering the spread of islam by committing acts of terror. The rest of the world looks at the actions as barbaric and therefore draws negative connotations  of islam