A diverse society enriches us in countless ways. If one wants first hand religious experence, one needs to go no farther than the corner mandir, masjid, temple or synogogue to attend services there and speak face to face with the Pandit, Imam, Mullah, Rabbi or Swami, and to PERSONALY interact with people of those countries and religions! What an educational experience that CANNOT be gotten by reading books!
Another fantastic example: I speak 6 languages -- 3 fluently and 3 proficiently, thanks in large part to a super diverse society. I was able over the years (1984 to 2009) to meet, date, and become great friends with, and in several other cases romantically involved with Iranians, Indians, Tunisians, Haitians, Mexicans, and Filipina women (before you doubt me, I am 61 years old now, so had plenty of time to do this!) And in the process become intimate with languages, religions, foods, music and more! It has enriched and changed my life for the better!
The list goes on and on and on.
Anyone who grew up in a super diverse community where there were no 2 neighbors ethnically alike in your 18-story building knows how wordly and far reaching their first hand knowledge and experiences are, not from books but from direct, hourly, daily, year after year after year personal experience and interaction and intimate relationships with these beautiful people.
Yes, diversity beats homogeneity 8 days a week, and twice on Tuesdays.