One of the better articles on the problems facing Europe. Longer read.
In headier days, Europe’s leaders dreamed of a multicultural continent, its aging cities saved by millions of new migrants eager to join a stable, prosperous urbanity. This was the promise behind former U.K. prime minister Tony Blair’s Cool Britannia, the multicultural fervor of Herman Lebovics’s Bringing the Empire Back Home: France in the Global Age, and the early enthusiasm that greeted Germany’s refugee influx in 2015—estimated now at 1.6 million.
That dream has faded, with Europeans now opposing new migration by wide margins. Once-peaceful German and Swedish cities have seen a spike in crime, a resurgence of anti-Semitism, and growing political unrest—all associated with the migrant influx. In 2016, Pew Research found that 59 percent of Europeans thought that immigrants imposed a burden on their countries. In addition, less than a third believe immigration has improved their countries, with 63 percent of Greeks and 53 percent of Italians, respectively, stating that immigrants have made things worse in their economically challenged countries. As the British political thinker Kenan Malik acknowledged in a 2015 Foreign Affairs essay, “multiculturalism” has devolved from “an answer to Europe’s social problems” to a fraught reality of “fragmented societies, alienated minorities, and resentful citizenries.”
In most places, the welcome wagon has been sent out for repairs. Nearly all European countries—even progressive ones like the Netherlands, France, Denmark, Norway, and Germany itself—have imposed stricter immigration controls over the last two years.
Unlike the United States, Canada, Australia, or New Zealand, modern Europe never produced melting pot societies. Though French Protestants and Jews, for example, played important roles over the centuries in the development of contemporary financial centers—first in Amsterdam and later in London—immigrants still were relatively marginal in most of the continent’s economic advancement.
https://www.city-journal.org/europe-multiculturalism
From the comments I can't vouch for the accuracy,
An inability to foresee and anticipate geometric/exponential growth is one of the brain's major flaws. In the UK, the Muslim population doubled every 10 years:
1961:0.1%
1971:0.2%
1981:0.4%
1991:0.8%
2001:1.6%
2011:3.2%
2021:6.4%
2031:12.8%
2041:25.6%
2051:51.2%