"Diversity" has exactly zero moral value. It is neither virtue nor vice. It is nothing but a side effect/symptom of creating the conditions for individuals to flourish. When you create those conditions it doesn't matter what people look like or what their culture is. Everyone wants it. Everyone will come for it.
Pushing "diversity" as a virtue is nothing but cover for all the other things they want to do that are evil. That, and it doesn't even work. People flee totalitarian and authoritarianism. QED