I also get that, living in a city in France, it's easier to avoid having a car.
yet I note that you could have a motorbike. You could not have kids. You could move close to your work. You could move in an area requiring less car. You could change your job to one not needing a car. You could bike. You could care pool with friends/neighbors/coworkers. You could use public transports. Etc.
But the car is an important artifact of the american culture. You kinda build the country around it, not the other way around.
Keep in mind, the shift from farming being a major employment sector happened while the current US infrastructure was being built. The highways and population distribution were in part because of that. Also the US is one of the world's largest in area, and while urbanization is being pushed due to changes in the labor needs, it's something that happens over time not over night.
As for "you could do X" most of your statements aren't really proof of an American obsession with cars, just a different infrastructure choice relative to other nations.
http://www.nationmaster.com/country-info/stats/Transport/Roa...
The US has 27% more cars than France per capita. That's statistically significant and reflects difference in city planning/culture, but IDK that I'd draw the same conclusions as you.
Why is not having a car an ideal for you? Why do you have to bike? Can't you just walk places?
I don't have a car because society is telling me to have a car. I have a car because it's faster to get places I want to go; it's damn hot in the summer; and it's great for carrying around purchases and the family.
And on the flipside, cars are cheaper than kids :)
Yet we travel around the area to state parks, bike trails, etc.. every weekend. Even if I lived in a city, that doesn't mean I would want to be confined to the same 10 square miles my entire life. We live in a vast, beautiful country. Why isolate yourself to a tiny little block? Life is too short for that.
It's just a matter of priority and way of life, with constraints yes, but a choice none of the less.