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It's scientifically proven that diversity DOES lead to Civic decay.
BUT, diversity occurs across multiple different strata, and those different strata have different levels of priority. If you've ever been to a sporting match, any sport really, strangers can become fast friends or total enemies based on their favourite teams. What has to happen is not the segregation of people (as the infringement of personal liberty is more detrimental than diversity, undermining it's own purpose) but the creation of a powerful overarching identity which unites people, typically a national identity, that supercedes the ethnic identities dividing people.