Send them packing.
Let me get this straight. Europe, in spite of its foolish socialist experimentation, has managed to create (as in the US and elsewhere in the West) civil societies, complimented with magnificent technological advancements that the world has never seen before. Wiping out many forms of illness and disease, increasing the life expectancies there and abroad, and these people (most fleeing their own failed states and butcheries) dare admit they want to implement the very ideology that has made their home countries into desolate hell holes?
H/T: Vlad