I saw a different explanation. Cities are inheriently high density and make things used enmasse as much as possible and inevitably leads to more contact among others. This is unfortunately also a good way for pandemics to travel. The isolation highlighted how little they owned spacewise.

Now that is a spectrum and we are all dependent on others but they are at the high end. The low end is "compound in the middle of the wilderness which is dependent indirectly for there to be wilderness unused for them to DYI everything".

The issue will hopefully wind up rare but there is no great certainty in these matters.