Joseph Pearce at First Things draws the inference from an article by Niall Ferguson that England is on the brink of a civil war between its Muslim and non-Muslim populations. The tensions between the two groups herald the failure of multiculturalism and are exacerbated by the Left's ennui:
The trouble, of course, is that the comrades, long since disillusioned with Lenin, have adopted Lennon instead. Whereas the old Marxists believed in something, albeit something absurd and dangerous, New Labour believes in nothing; "nothing" as defined by John Lennon in his sentimentally pernicious imagination: "No heaven ... no hell ... no countries ... nothing to kill or die for and no religion too." This is the new hedonism with which the secularists want to unite British society; the new uniculturalism to replace the old multiculturalism. It is perhaps not surprising that many Muslims are unconvinced by this self-centered hedonism in which, to return to Lennon, "all the people" are "living for today." If this is all we have to offer, to hell with it.
In other words, Muslims, disgusted by Western decadence, regard the West with contempt because they see that it on the verge of having nothing left to fight for. A culture this far gone in the direction of spiritual suicide, they believe, is like ripe fruit ready to fall into their hands. Thus we see Muslims emboldened to hasten the destruction of the social and political structures of the European countries in which they live. They're likely to be convinced, listening to the Left, that it would be an easy matter.
Read Pearce's whole piece at First Things.