Nature abhors a vacuum and I've heard that the same applies to spiritual beliefs. The West has abandoned much of its spirituality (primarily Christianity) for secularism. Perhaps this has left a void that is now being filled increasingly by Islam. Many people no longer have a basis (spiritual or historical) for refusing or opposing it. That and they have been conditioned by multiculturalism to see Islam as co-equal to anything produced in the west. Its just another way to live. (We must ignore the stoning of women or homosexuals, honor killings or threats to assimilate or annihilate those who do not embrace the true faith)
I don't know, I'm just casting a line out here for reasons. So many people seem hell-bent on proving they tolerate or accept Islam while overlooking its significant dark acts. Yet they are quick to pounce on any shortcomings of conservatives, Christians or Jews as reasons for rejecting and ostracizing those people, be they real or as is frequently the case, imagined. It puzzles and confounds me.
Also, there is the aspect of Western women who have totally emasculated their men and are now nostalgically seeking for aggressive, violent, sweaty masculinity. That they are totally ignoring the rape statistics is probably something that has to do with the mental incostistency from which the majority of the female sex suffers.