Gonna be hard to put it to words, especially because of the rather broad scope of my question, but I think it can be a proper submission here.
Here on Earth, regardless of the period and location, in the majority of occasions, the most fundamental unit of society was somehow related to bloodline. Most obviously, family is such a bond, but certain cultures also preferred a larger scope of family (15-20 people rather than the current average of 4-7), and after all, a nation can also be considered a grand (though also more vague) definition of "blood relations".
Postmodernism, both as an idea, and as a period (manifesting in genres like post-apocalyptic or cyberpunk settings) deconstructs and often rejects these old values, as they are steadily becoming less valuable in these new, often survivalist environments.
Partially as a result of this, in my own fictions, I tend to focus on the meeting of characters with little to no bonds to anyone else, often wandering, rather than living in a fixed place.
Is it possible that up to a point, this phenomena become so widespread in a world that people would accept "drifting" and always being with strangers a basic and even expected way of social interactions?
Or the need for companionship, unity, and an actually viable society is strong enough to never diminish from the human nature?
You may use exact examples if you desire.