| I'm with you 100% until the last paragraph. We are definitely social creatures, and living lives of increasingly less social interaction is not going to work out for us personally or as societies. But I see no reason we can't handle society at a scale of millions or billions of people. It, after all, always is experienced as less than that, even people who live in NYC or Mexico City have regular interactions with a smaller group of 100-200 people at most, even if incidental daily interactions with more people than most of us. But those incidental daily interactions with a huge number of people -- I am pretty sure are actually positive. To the extent that I'd predict that even in the present society with social interaction limited by the social forces we're talking about -- someone living in manhattan who, on the average can't help but interact incidentally with a huge number of people daily (on average, there are exceptions, going up with wealth!) -- is likely on average to be happier, due to those interactions, than someone in a suburb working remotely who has one to two incidental interactions... a week? I think those incidental interactions are in fact key to happiness, the more the better, and there is no problem if due to living in some of the densest places on the planet, they are with a huge number of diverse people. Also I think people seriously under-estimate the extent to which humans have lived in "urban" societies for many thousands of years. Granted, the scale of "urban" was smaller than it is now (a city of 20K people was enormous 500 years ago), but we have always been extremely social creatures, always in fact, in general on aggregate, looking to maximize our number of relationships and interactions. (See eg _Dawn of Everything_). (I also think people way over-estimate the universal cultural homogeniety of "ancient" and "pre-historical" civilizations. Things were not as we assume). |
I think the probable reason is pretty straight forward. When there are "too many" people in an area there's a really good chance any given person you encounter is someone you'll never encounter again, or sporadically at best. So you start seeing other people as something more like NPCs. We obviously understand other people are other people, but given you'll probably never see this person again any sort of encounter is generally going to be exceptionally superficial.
And even if you try to change that, it's probably not going to be reciprocated. If somebody in a small town wanted to kick up a conversation with and get to meaningfully and really know me, I'd happily reciprocate. Go to their house for a beer or even dinner? Sure, why not? If it happened in a large city, I'd expect he's probably a scammer or just not all there. In either case, I'm going to be looking to end the conversation and move along ASAP.
So you get this paradoxical scenario where people surrounded by orders of magnitude more people end up lonelier than those with far fewer faces about.
[1] - https://pubmed.ncbi.nlm.nih.gov/30609155/