A healthy ecosystem consist of a wide variety of organisms. Take away much of the diversity and the whole system breaks down. When the genetic material in an organism becomes too narrow and refined that organism is soon to become extinct. Ecosystems breakdown and collapse with the loss of diversity. In a monoculture of a single species pest and disease spread rapidly.
Diversity is the essence of a thriving community, social or ecological.
They say that they cherish and embrace cultural diversity on the one hand yet shun differences on the other. There are many people of diverse lifestyles and mind styles that want to live in alternative ommunities. I think that they suffer from a narrow vision and a lack of cultural diversity that would make the community dynamic. Studies in anthropology and evolutionary biology found that overspecialization is the cause of extinction for both human cultures and plants and animals. If there's one thing we've learned from nature, it's that diversity is the key to success.