Where do you get this data from? I've been living in Amsterdam for 5 years now and all of my friends or people that I know of that live somewhat in the city don't have a car... because (1) they can't afford it and (2) they don't need it. Biking infra is so freaking amazing that it makes me want to bike all the time instead of getting the car (even if I had one). Driving around with a car in Amsterdam is just madness. I did it a few times for moving heavy stuff around and it's a mess because you're redirected across streets making it 5x longer to get to where you have to.
I think your experience comes more from people living outside the dutch cities, in more rural areas? Then it makes sense to own a car. It doesn't make sense in a densely populated area.
But anyway the Netherlands has really figured it out when it comes to public transport. No other place comes close in my experience. People who grew up here perhaps don't realize how lucky they area... and how shit it is in other places.