Diversity is a bad thing, it destroys community and it makes shared norms pretty much impossible. Even in areas like my own that have very little of the type of diversity that is actively dangerous (i.e., lots of NAMs), it still sucks because it creates neighborhoods that are nothing like the communities where most of us grew up — they aren’t even neighborhoods, just collections of atomized nuclear families. Walk around outside sometime, and count the number of people that you see out and about in such a neighborhood. Then compare what google’s stats will tell you about how many people actually live there. Even a significantly introverted person like myself is bothered by this, it isn’t the way that human beings are designed to live. Putnam’s work has the same observation if you prefer not to trust your own lying eyes or mine.