The Koran forbids them from interacting with nonmuslims.  They are permitted to live outside of their muslim theocracies only if engaged in jihad, which, if one reads the news periodically, it is clear they are actively engaged in one with the rest of the planet.  Before I learned this by reading the Koran, which is something that most muslims never do (the literacy rate in muslim nations is abysmally low owing to islams rejection of education beyond the Koran itself), I had tried to engage in conversation with muslims and was always ignored.