I would strengthen "Canadians want immigrants to fit in" to "Canadians want immigrants to make the effort to fit in", meaning not only the recent immigrants but their cultural hosts. For the Muslim community this means, in particular, the imams. Their preaching is very influential, for good or for ill. I suspect that Muslims cause more disquiet than other minorities because they are perceived to be religiously observant, and hence more prone to be led, or even manipulated, by their religious leadership.