And a hundred years ago life for most humans was just sitting in various boxes only accessible by walking, or horse if they were rich enough, and there were far fewer boxes to choose from.
There isn't always a car between members of our species and intersubjective experiences happen more often than they did prior to mass transit because cars allow for greater range and more efficient travel, and thus access to more people and more experiences.
There are entire cultures that have developed around cars and car ownership that facilitate bonding and community between individuals.
I'm all for reducing automobile usage and creating more walkable environments but the premise that cars primarily serve to alienate and isolate people seems wrong on its face.