Uber-liberal western European countries have a low birth rate. Liberated women don't want to have children. They want to enjoy life. The country needs workers though, but the citizens are not reproducing enough to fill the need. What to do.
Import thousands of people from third countries who breed like rabbits. The big thinkers in government who import the mentally-challenged foreigners think the idiots can assimilate and become good citizens. Problem: many of the immigrants are semi-literate, low IQ, religious fanatics who don't want to assimilate. They're only fit for menial jobs and would rather riot and kill infidels. The libs who run the country refuse to do the right thing and send all the unassimilable malcontents back to their pesthole countries.
The semi-savage barbarians eventually become the majority and take over the country. The former once proud natural citizens are reduced to a tiny minority and either kowtow to the barbarians or have to emigrate. My guess is that many Swedes will end up dhimmis and wear appropriate clothing becoming virtual slaves in their own country.
2) Encourage these Muslim residents of non-Muslim host nations to shift the demographic scales in their own favor by means of population growth—and separatism—thereby enabling them to more effectively advance an agenda based on fundamentalist Wahhabi teachings and the legitimation and spread of Sharia Law in the West.
3) Eventually the proliferation of Muslims in the host nations will hit critical mass,tilting those societies toward majority-Muslim status..