My family live a 30 minute drive away, however there are no buses that go directly there. No trains, either.
I would appreciate more public transport, for sure, we absolutely need that as well. More, higher-quality public transport that is ideally available 24 hours.
But nobody is ever going to build that from my front door to my family's. The best I can hope for is to reduce the number of changes I have to make. Right now it would take a bus to the nearest town, another bus to another town in sort of the right direction, another bus to the town center nearest to my family, and then another bus to get me to a street 15 minutes walk away. Even if that drops to two buses, my car will still simply be faster & more convenient.
Quitting cars in cities is a fine goal -- when commuting into cities I tend to get a bus or a train rather than drive, but for everybody that doesn't live in a city, or travels outside of cities, it's simply not possible to get rid of cars. Sheltered personal transport, which largely comes in the form of cars, is not going to go anywhere.
This is nice, but you absolutely must recognise that the amount you're paying for your car does not begin to match what it costs the country for you to have a car.
Road infrastructure is heavily subsidised by the tax payer.
If you had to pay 3x more to operate your car, would you be more or less likely to be in favour of bolstering public transport?
Population density is definitely a factor, and private vehicle ownership should always be possible. But the sheer size of our current personal vehicles and the tiny amount we pay vs their actual cost to society needs to be addressed.
And to those who are in the small minority who don't use it, would you also ask childless couples to pay for schools? Or people never intent on flying to pay for airports?