Maybe because I don't think that there's anything wrong with being Muslim, to me these are not scary numbers...
Being Muslim doesn't mean you didn't integrate into a culture. My wife is a nurse, and the hospital she works at has 40% Muslim doctors. They're people, just like anyone else. Some are fantastic, some are not. My favorite ice cream shop is owned/run by a Muslim family. Wearing a hijab doesn't mean that you didn't learn the local culture. It's fine. The ladies behind the counter make the ice cream with a hijab on. So what? They're just as American as the white people buying their ice cream.