MARK STEYN:

These young men are, de jure, British subjects and, de facto, the demographic energy of every city down the spine of the country. “Islam will dominate!” they yell, impatient that it doesn’t already, not entirely. The delusions of multiculturalism have brought about the death of England – in nothing flat. An amazing feat.

It’s what happens when you have a ruling class that decides that it doesn’t believe in the country it rules. And a citizenry that lets that rule continue, anyway.