Mandelstam:
Agree on just about all of what you said.
Recognizing that Switzerland is tolerant and diverse in religion and language, it still does not have AFAIK anywhere near the diversity that many other countries, including the US, deal with in terms of racial and broad cultural diversity. I don’t think it has had cities with a large influx of immigrants from countries with dissimilar cultures, for example. I could be wrong on this, especially as concerns recent years, so please correct me if my impressions are inaccurate, but I think the U.S. has a harder job to do because it is more diverse.
That said, I think American cultural diversity is a wonderful thing. From a selfish viewpoint, although I am not living in a major city, I can get good Japanese, French, Italian, Chinese, Indian and Turkish meals with less than a half hour’s drive. It’s also a challenge, since people with very different cultural backgrounds have to try to accomodate each other, and some are more successful than others, to put it as kindly as possible.