Western Civilization as mostly practiced in American Briton and the EU is of judo/Christian heritage and based on 5,000 years of history and learning. No other belief structure is compatible with what we commonly believe. Therefore it was a major in not civilization changing, mistake to lets others into our culture that did or do not share these beliefs; Islam, in particular, is tital incompatible with our way of life and so its no surprise there is so much violence perpetrated my those that practice Islam.