Inre: Jews in Europe, I was referring to more strictly observant Jewish communities, a feature of life in Europe for hundreds of years, sometimes coalescing into voluntary Jewish quarters and often in involuntary ghettos. There are places in America that you would feel very uncomfortable walking if you were without a beard, hat and tzitzit (a vest/shirt with tassels). I don't know if Denmark has a population so observant, but if it does, I would bet they consciously try not to integrate into general society.

Denmark has a proud history of standing up to Hitler in WW2 inre: Jewish rights, and if I lived there, I would be proud of it.

I think that the acculturation issues are deeper than you seem to, though. For instance, I'm half Greek -- I can tell you for some Greeks cheating the system is a cultural positive. That is so very, very different than what you describe in Denmark. And that culture-cheating perspective is far more common in the Mediterranean basin than it seems to be up North, for whatever reason.

If my grandfather was any indication, you can put an immigrant in a new country (America in my case), but you will not take away the whole culture. It takes a generation or two, and that's in a population that's pretty aggressive about assimilation -- greek immigrants are encouraged to go to good universities and climb the social ladder. My grandfather was full of stories about working the system until he died, and he was proud of them. I don't think it's uncommon.