once they HAVE a car, they will use it because it is simply faster and more convenient than mass transit can ever be.
It's interesting that you believe that mass transit necessarily is slower and less convenient for people, yet still want it any way.
Why do you hate people?
I understand that time is the one asset that is truly finite for all of us, and indeed, we never know how much of it we have left.
Who will say, on their deathbed, "I'm glad I spent an hour a day riding a bus" ?
Busses are a poor form of mass transit because they usually take the same roads that private cars do. A bus will never be faster than a private car unless you factor in the car's time to find a parking spot, and the city in question is terribly congested.
Subways, or any other transit system that is disjoint from the road system, can be MUCH faster than a private car. And I've chosen to use them even when I had a private car available to me.
People will and should use mass transit when it makes their life better -- when it saves them time and lets them do more fulfilling things with their life.
In places like Munich, Germany, it is possible to get most places in the city via very fast u-bahn lines. We lived there for about 2 weeks and didn't have a car. When we did have to go somewhere that u-bahn didn't reach, dealing with the bus system was jarringly bad in comparison. Suddenly we had to become aware of times, schedules, etc.
The Ubahn system is great because it's difficult to get on the wrong train, and you don't need to memorize a schedule... the next train will always be coming in a few moments.
When we toured Germany outside of Munich later on, we had a hired car, but we did not take it into urban core areas (like Berlin). We would park at a free park and-ride on the outside of town -- which were ajoined to s-bahn lines. Then we would take the s-bahn line to the hauptbanhof (centrail rail station) at the city core, and from there we'd take ubahn lines as appropriate to our various destinations.
For areas with high urban density, disjoint mass transit (like subways) is a great option, and having a personal car in the city core is usually a liability because parking it is so frustrating, and ultimately, expensive in terms of dollars and human time.
I love driving and have many days of race track time to my credit. I also built my own RV out of an old school bus and we take long family trips in it. In my family, we like driving and private cars.
However, when there is advantageous public transit available to me, I use it.
It is possible to build transit systems that work with the reality of how people live instead of some central planners idea of how she wishes people lived. Good systems can and will prosper.
Systems that don't improve the lives of their users should simply disappear so that better choices can come about.