Multiculturalism doesn't create discord. In the absence of multiculturalism, people will invent differences to fight about.

In the town of Accident, Maryland (USA), an all White (western and northern European ancestry), almost exclusively Christian area, there are three Lutheran churches. Two of them sit right next door to each other. This is because the members of one congregaton of White people of European ancestry who are all Lutherans, couldn't get along. So they split into two different factions instead of finding a way to stay together in harmony.