Muslim awareness of the "invasion by immigration" option.

They know this. Stupid Westerners bend over backward to avoid acknowledging this:

After all, [Muslims] uncompromisingly divide the world between Believer and Infidel, and between Dar al-Islam and Dar al-Harb, and preach the doctrine of endless war -- not necessarily by open combat, for the money weapon also comes into play, as well as "pen, speech" and Da'wa, and now demographic conquest (discussed endlessly at Muslim sites and in the Muslim media, for everyone is keenly aware of this instrument of conquest in the Camp of Islam, even as they are amazingly unaware of it in the Camp of the Infidels). They view Europe as a land to be taken over, won for Islam, not a place where Muslims are to embrace, in the slightest, the doctrines or beliefs or legal and political and social institutions of permanently inferior Infidels.

"Fitzgerald: What they learn -- and don't learn." Robert Spencer, Dhimmi Watch, 1/2/07 (emphasis added).