I dont get ppl who think or assume that everyone does. A lot of people dont drive at all
You need to understand the part that you are not understanding...
In the U.S.A. - with only a few exceptions for certain scenarios - owning a car is considered to be a necessity. And, in this context, I am referring only to its use for
personal transportation. (Not including trucks needed for the farm, etc. additional uses.)
In the U.S.A. - believe it or not - owning a car is considered to be (in a way) a "rite of passage" (not kidding).
With the few exceptions mentioned above - if you live here and do not own a car - you are in a real predicament.
You can hardly expect to be able to get a good job - one that will provide a sufficient income to support a family - unless you own a good car that will get you to work every day.
Rare is the case that public transportation is built or designed to go to these places - unless it is in a very large city. It basically does not exist anywhere else.
Anywhere other than in the larger more dense cities - including the smaller cities and towns - it can be (and usually is)
miles to work, to church, to the grocery store, anywhere you might want to go.
It is generally considered to be a practical necessity to have a car, truck, motorcycle, etc. - something that will get you where you need to go.
Another thing...
We consider it reasonable for anyone to not have to wait for public transportation to show up - if at all possible - to get where they want to go. If you have a car, you are pretty-much at liberty to go anywhere you need to go the moment you want to to go there.
It is considered "unfortunate" (and, in some cases, dangerous) to have to travel via public transportation. You are considered to be "poor" and/or at some severe disadvantage if you do not have a car.
I had a job once where I had to take the bus to work and back home. And, not just a single bus - but three - to make the trip. And, having about 10 minutes wait time between bus #1 and bus #2 - and, 30 minutes wait time between bus #2 and bus #3. It took ~2 hours to make the trip one-way. I could have driven it in 10-15 minutes.
Having a car is so entirely woven into our society that - if you do not have a car - it "robs" you of certain
basic parts of our society (that many take for granted).