Europe is dealing with sections of people who have never stepped foot in a predominately Islam worshipping country (Iran, Pakistan, etc., are mostly middle class, whose parents/grandparents were refugees, mostly young men. In London, for example and other areas in the UK the inmates are running the asylum. UK officials know where "danger" mosques are, know where the muslim grooming gangs are and turn a blind eye because they do not want to be seen as bigots. They couldn't be labeled as racists because Islam isn't a race, but they sure could be called white supremecists, bigots, Islamophobes (as opposed to Christianophobes, Hindiophobes, Judeophobes or Buddistophobes I guess lol). They have been, and will keep doing, trying the appeasement route and hope that their cowardly benevolence will win out. These European governments (led by the EU for the most part) flood their countries with migrants, refugees being the smallest number, and hope that these people will assimilate and adopt European values. Most do not and only wish to dominate and segregate and have no interest in western values. The UK has gone to the extreme of jailing people for speaking out about these practices; they will arrest their own citizens and then dig up whatever they can to put them away for a while (shut them up). They've done this a few times already with Tommy Robinson; the first time they did this he was stabbed and had all of his teeth knocked out while in prison, by extremists in prison. Really scary stuff happening over there.
These sections/groups/mosques are openly supportive of terrorism, train on gun usage, murder, segregation, discrimination, etc. You can see a snippet of an expose that exposes some of these teachings here: https://www.youtube.com/watch?v=mbMrPeSYpJU . Think living a life out in Leviticus. Think WBC teaching violence instead of just protesting.
I continue to believe in one of the most important rights of the US, that of freedom of religion. However, when communities such as the outliers we're talking about in this thread, I can't blame a country for dispatching them out of their borders. Should they just imprison them?
We have to keep in mind that these just aren't disagreements in religion or ideas. These are groups that are largely funded by other countries, teach violence. What do you do with them? Just let them go like the UK does? Ignore them?