Car infra takes next to nothing to plan and build. Trains, trams, metro, anything big at all really, takes decades, riddled with corruption, environment destruction, landscape change. State actors, maybe society, is just plain bad at organising this. Maintaining and switching cars is easy, maintaining public infra, keeping timetables (!!!), organising upgrades and extensions, keeping workforce happy and not striking is the same as above. And I live in a fat rich western country.
I get that cars don't scale, and ok, downtown of 1m+ cities should be park & ride. But maybe we should just spread out our living area more, and outside of megapolises just admit defeat and improve car infra.