The Koran instructs them not to live among the infidels except to take over the lands of the infidels --- you're right, their only purpose in being here is to conquer our country and place us under their own form of government. If they didn't believe this they wouldn't be muslims.
I thought most of them came here to run 7-11s or engineering shops while their kids went to school. Kinda like your grandparents.