>Car infrastructure is typically a huge part of the costs of any city. Car drivers, at least in EU where I live, are net cash cows to the local economy with all the taxes they pay on everything car related and second order business they support: fuel tax, car tax, insurance, parking , service stations, gas stations, shops, dealerships, finance leasing and banking, towing services, emissions tax, etc
All of these businesses profit from car drivers. If you remove cars you'll have a massive hole in the economy. That's why no government has banned cars, but just made driving expensive to increase the money they get from drivers and add it to the city/government budget that then gets spent on public transport infrastructure..
> Roads and parking spots and so on don't maintain themselves.
Roads and parking spots are not free for car drivers(where I live), they pay for them directly in taxes, and it's a net profit for the local economy. That's where the maintenance money comes from.
>If most people used public transport, you'd need far less road infra to maintain every year.
Buses drive on the same car infrastructure as cars and cause more road damage due to their massive weight so you still need roads and maintenance costs. If you replace cars with more busses then the roads will see even more wear needing more money except now you have less money.
>Anyway, my point was about how we allocate existing money,
That's an economically illiterate and purely ideology driven take that makes no sense. You can't allocate existing funding away from roads towards more public transport because exiting public transport also depends on roads existing and being maintained, with money from car drivers chipping in to share those roads.
If you want to improve or add new public transport(like build rail or buy more busses) then you need to get more money from somewhere. There's no free lunch where if you get drivers off the road then suddenly you have more money. No, now you have less money.
And I'm on your side in spirit, I want a car-free society. But for that I want to see Swiss levels of public transport first. Life is too short to waste it commuting on bad infrequent and slow public transit that doesn't take me where I need to get. Hence driving cars FTW.