I'm sure there are some. So what? At some point there is still a breaking point where it just won't work. At some point, the situation needs to be evaluated and you need to ask if continuing what you've been doing is going to make things worse or better.
Multiculturalism doesn't work in the middle east. It hasn't worked in practically all of history (without an extremely overpowered government holding it all together). And the more multicultural Europe becomes, the more extreme rhetoric, the more the violence, and the more the hate.
Europe doesn't need to import more problems (any more than any other place, really). If it continues what it has been doing, then it certainly will have more problems. That's just how it is.
Question is just when people will say enough's enough.