As for integration, I don't see why people who are judgemental. There are tons of immigrants to the US who don't speak good English. Are you going to tell them to get the hell out of this country? What if they're parents of children who learn to speak English better than their native languages? That happened a lot.
People should be able to improves their lives. Sometime that means moving to a different country. Sometime that means struggling hard where they are.