People also don't want to value just the presence of strangers, the way the in some countries the culture treats it as an honor just to invite people over to your home. Even in America a sense of neighborhoodliness was seen as a virtue in the past. That, though, is a positively strange idea in modern day America, in fact. I wouldn't even try to say I consider an honor to invite the awkward guy we work with over and talk with him(not saying I necessarily do have those virtues myself, I'm also a product of our times). People would not understand it at all.
I chose these particular examples because they were so common in the past and are now controversial. I'm sure someone will tell me they don't need religion or that some strains divided people more. I'm also sure some people will tell me it's weird and possibly even pointless to insist we all invite each other and make friends, even with the awkward people that have a hard time socializing, and I'm sure some will say they don't need that to be happy anyways.
Looking at large scale trends, though, these are things that were important to American society in the past that are now not so common. They were foundational to societies cohesivenessm. And they just haven't been replaced completely with institutions that replace those functions-- which is the key issue here. You don't have to be religious or invite lots of house guests-- I'm not saying that-- but damn if those kinds of things didn't provide benefits for society. And those also certainly aren't all the institutions that needs to be replaced.
I'm not entirely sure who pushed for these changes, but I do know people today relish them-- and even if their great grandparents can't out of the grave and said "I can tell your first hand these are the institutions that kept us from being lonely" I think many would still outright reject them.
I think the powers that be benefit when citizens don’t trust each other in almost every hierarchical system because it’s a more stable condition (people aren’t banding together for the greater good).
In America, Reagan did a lot of the same shit; as did daddy Bush, Clinton, W, Obama, Trump and now Biden. There is bipartisan corporate oligarchy kleptocracy, and the Brits have caught up by defanging any people power in the Labour party via vile smear campaigns.
In both countries the tactics are the same - buy the media, the police, and the politicians. Sell weapons to the worlds worst regimes. Deregulate finance and environmental protections, subsidize fossil fuel bastards, and privatize healthcare and every other common nationalized good from water to waste.
The widespread fear and distrust and doubt you speak of is spread through the media with full intent by these people, so as to get away with more shit more easily.