Is taking walks maybe an uncommon thing in the USA?In many places, yes. But part of the article takes place in New York, where it isn't.
I have lived without a car for over a decade. Almost everyone immediately assumes that I am simply poor and can't afford a car. This happens to also be true, but I wanted to live without a car for a long time, I'm an environmental studies major and I have terrible eyesight problems. I always hated driving.
In over ten years, only one person ever asked why I gave up my car. Everyone else just assumes they know and assumes it is poverty.
In the US, almost everyone drives everywhere to the point of ridiculosity. I gave up my car while living in an apartment complex where people drove their trash to the dumpster and drove to the mailbox. I lived within a 15 minute walk of three shopping centers. Initially, no one walked. The streets were all deserted.
After I gave up my car and began walking everywhere, walking caught on. But before that, people drove their kids to the pool in the apartment complex and really crazy stuff like that.