I don't think many European countries have considered the full effects of letting Muslims into their lands. The Muslims breed like rabbits...Europeans hardly breed at all.
Have they thought about what will happen when a country like Sweden becomes majority Muslim? I doubt it. Of course they brought them in under the deluded liberal belief in the equality of all cultures and the idea that all the immigrants from backwards mideast countries would readily assimilate and become good Swedes, Norwegians, Germans, etc.
LIberals, by good intentions, destroy what many industrious and moral people took centuries to build. Liberal inability to face reality might cost many European countries their freedoms.