Causes of terrorism by 'the Arabs' against 'the West‪'‬

My assumptions are the following: the true causes of terrorism by ‘the Arabs’ against ‘the West’ lie in a colonial history of the Middle Eastern region of the 20th century. Religion, i.e. Islam, was and continues to be used to reach political objectives. Finally, while economic gains are not primary objectives of terrorists money play a crucial role in this business; while for some party terrorism is a tool to reach political aims for others it is a big business.