The dire threat of resident Muslim populations.

The intent to Muslims in Western nations to subjugate any of their host societies is conclusively show in Fjordman's extraordinary essay.

An excerpt:

[Emigrating Dutch] leave what was once their country in favor of people such as Dyab Abou Jahjah, founder "of the Arab European League (AEL). The AEL, founded in Belgium in 2000, now has branches in the Netherlands and France, and intends to spread across the EU. Jahjah, who has called the 9/11 attacks "sweet revenge," recruits Muslim youth to spread his ideology, which calls for the introduction of sharia in Europe. "We have three basic demands he says. "Bilingual education for Arab-speaking kids, hiring quotas that protect Muslims, and the right to keep our cultural customs." "Assimilation is cultural rape. It means renouncing your identity, becoming like the others." Jahjah has also demanded that Arabic should be made an official language in Belgium.

"Beheading Nations - The Islamization of Europe's Cities." By Fjordman, Dhimmi Watch, 7/12/06 (links in original, emphasis added).