With clarification: I don't see any reason why people should have to drop their religious beliefs when they come to another country, and halal food is part of Islam. It doesn't actually hurt anyone for halal restaurants to be opened up in neighbourhoods with a high proportion of Muslims. It's also good business sense.

It is very much not-good, however, when immigrants move into one area and then continue living their lives as if they were back in their old country without learning the new language, or making any effort to integrate or whatever, which often happens.