Diversity isn’t easy. It’s even harder in countries like Denmark that have, until recently, had very few immigrants from Muslim countries. When you add religion to the mix of language and culture, it’s still harder. Throw in the tensions between Muslims and the West in a post-9/11 world, and now you’re talking about a really daunting challenge. But it is a challenge Europeans, Americans, and every diverse society must overcome. And seeing this kind of progress in Denmark, coming from some of the same people who were at the center of fomenting violence in 2006 — well, that gives me reason to hope.