What do you think about how this relates to communities shifting almost entirely to the internet?
Bowling Alone is a popular book about the decline of "social capital" (community), which is a fair intro to the topic.
https://en.wikipedia.org/wiki/Bowling_Alone
IMHO, technological advances begets social upheaval and accelerating inequity are the root causes for the popular usual suspects (broadcast media, cars and suburbia, social media).
Orthogonally, since Trumpism, I've been more open minded towards explanations rooted in reactionary populism (revanchism) and white racial animus.
I do think it's interesting that the Old Internet was more spontaneous, unorganized, and high-trust than the New Internet. It would be effortless to find counterexamples to this claim (back in the day I got death threats, now we have moderators for that!) but the fact remains that any new prosperous sector of the New Internet is immediately invaded by advertisers, authoritarian moderation teams, and the Eternal September effect, and the way that people present themselves on the New Internet is far more curated than in the past.
There's a street in northern Baltimore where you don't actually go into any of the shops. Instead, you walk into a foyer-mantrap hybrid made of bulletproof glass. There, the retail employees ask you what you want, you tell them, pay, and then they go get it for you. Experiencing it for the first time was bizarre. Not an area I felt safe parking my car.
Baltimore is so weird, sometimes feels like living in Rio de Janeiro but only the bad part of Rio. None of the music scene, night life or beaches of Rio, but all of the inequality and violence.
Or e.g. in Seattle in an otherwise-normal store they have alcohol under lock and key and you have to get an employer to give it to you - a hybrid model.
The most remote, homestead-y places will have unattended "stores" where you leave out goods and people come by and leave money in the basket and take what you have. The least remote, most-managed places have security locks on items over $15. It is impossible to run a friendly, neighborhood-run store when any new customer is a potential thief. When theft goes uncontrolled, owners begin to look at their customers with suspicion. Those who don't like theft leave for more peaceful places and are replaced by owners who will tolerate theft with a big insurance policy and force.
It is continually astonishing to me that so many "community-focused" people don't realize that unilateral actions of harm inside the community (theft, assault, etc.) have ripple effects that harm the entire community. If you grow up in a region where store owners believe you might be a thief unless they personally know you and you have to constantly worry about protecting what's yours, and I grow up in an area where I'm trusted and respected by business owners and I leave my door unlocked when I go to town, how is equity meaningfully achievable between us?