It's not, of course.

London, Birmingham and God only knows how many other cities in the UK. London in particular is the most obvious example of why accusations of paranoia and alarmism are either malice or stupidity - the city has changed from being over 95% aboriginal to <50% aboriginal in just 40 years. and it didn't even end there - now it's below 40%.

and when all the other cities in UK, France, Germany, Sweden and other "wir schaffen das" countries change as dramatically, the people who are currently saying "it isn't happening" will change their tune to "it's actually a good thing"