Earlier quoted context omitted.
The issue is the number of people who ‘surprise’ you with out of control behaviors that are a huge issue with room mates. And getting out of living situation with someone like that can be extremely difficult. People can seem perfectly fine, until they seem to spontaneously turn into hoarders, or start eating all your food and lying about it, or start being aggressively in your face about a bunch of antagonistic cultu…
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There's some truth in what you're saying regarding social cohesion, but you're skipping some very important steps like the media fanning reactionary flames by scaring rural dwellers that "diversity" is going to come for them, etc.
Meanwhile people who are confronted with actual diversity in their day to day lives are less likely to buy into such simplistic and destructive narratives in the first place.
This implies that the lack of social cohesion is better thought of as a result of hostile media convincing everyone they are under attack by some "other", than slightly different humans in people's real-life communities.