I wasn't saying we could just suddenly ban them tomorrow.
The solution is hard because of how bad we've gotten things. But the solution has little authoritarian about it. We just change our priorities for the design of public infrastructure. We don't even need to actually ban cars at all. Make it practical and enjoyable to do everything by train, bike, or walking whenever possible and most people will happily do it. The result is a huge decrease in deaths both through healthier living and less cars.
https://www.youtube.com/c/NotJustBikes/videos describes things pretty well and accessibly. In short: the Netherlands was on track 40 years ago to be nearly as car-dependent as the U.S. and yet protesters blocked some highway proposals and the country went in a different direction. Today, it's the best designed place in the world, and its even better for drivers too.