It is not fine when, like everything else, it is taken to the extreme. Those who came here to be part of our unique culture and become a part of it, learn the language helped the country. When you bring in large numbers of sewer rats who have no desire to become part of our culture but to kill or convert then NONE of them should be allowed to stay. NONE. Period
Integration into a culture is a naturally occurring phenom. It takes two, sometimes three generations -- as it did for the Irish and Jews.
Today, there is a new wrinkle that didn't exist at the turn of the century -- cheap communication and transportation back to the "old country," which makes those ties more difficult to break.
However, you can see traces of integration among recent immigrants in their children. It is not uncommon to see kids of immigrants wearing hip-hop clothing, listening to pop music and indulging in other American past times.
I trust you don't expect mudslimes to follow this tradition! They do not want to integrate into this culture but destroy and or convert it. They may pretend to integrate but only so we drop our guard.