"Multiculturalism" is a unicultural phenomenon. It exists only as a Western fetish, and we don't believe in it, not really. Most people, given the choice, want to live in an advanced Western society. That's why even impeccably PC lefties refer carelessly to other cultures as "developing nations": the phrase assumes they're "developing" into something closer to ours, because that's the direction of progress. Even hard-core multiculturalists only want to live in a Western society. For one thing, that's the only place you can make a living as a multiculturalist.Too bad there's no way to fit all that on a bumper-sticker.
Actually, those dippy kumbaya 'Coexist' stickers you see on every other Prius or Volvo sum it up nicely: I loudly proclaim to everyone in my rearview that people should settle up and get along peacefully, but that's all the effort I'm willing to make toward my skypie ideal.