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I read an article, a year or two ago, that said that at some point with continued immigration and misbehavior by Muslims, that eventually a hardliner will get elected on a platform of "Throw them out!". The article specifically mentioned France as a country where the French are getting tired of all the crap. If the Europeans continue to let them in in such a wholesale manner, European culture will be destroyed.
That notion of hardliners coming into power (of course) might be unsettling..., what other plans might they have?
To my eyes, Europe has a much more difficult problem than the USA does re BAD immigrants (even with savage gangbangers like MS-13).
Usually, it takes more than a noble cause and proper programming to achieve prosperity on a multicultural nation. As a country, in Greece, we've been around those people for longer than 10-15 years now. I believe that the best thing the countries can do, is to enforce the "at home" beliefs. You want to believe in God, Allah, Buddha, whatever? Alright! But do it at home!
Practices like sharia has no place within a western culture country. At least not out in the open! I once saw a man hitting his wife in plain sight on the street! Could you tolerate this? The western countries have their own system of justice and it has to be followed by everyone. What this man did, violates the country's law of equality between man and woman. He ought to be brought to justice.
Things like that will have to be "fixed". I think those people are now behaving as the rest of us, but there are "cells" that I tend to believe never came into the EU for a good cause. Charlie Hebdo was one paradigm, I believe more will follow. Until every single one understands that we all must follow the same rules if we want to live together. Willingly, or forcefully.