Except it's not private money. Private vehicles have been heavily subsidized for almost a century in the US. We've had decade after decades or tax credits, interest-free loans, and bailouts to the oil and automotive industries. Most local road maintenance is financed with debt, and that debt has started to bankrupt municipalities. Minimum parking requirements encourage sprawl and reduce the tax base by filling these municipalities with land that is economically unproductive.

This all applies to electric too. Tesla famously would not exist if not for years and years of government money propping them up and artificially lowering their prices. Plus all the incentives for building owners to add charging stations, and the billions of dollars going towards expanding EV charging infrastructure in general.

And if you want to optimize for efficiency, personal EV's are still not even close to buses or trains. Personal vehicle ownership absolutely does NOT make economic sense for anyone except the owners and managers of the companies who profit from them.

American suburbs aren't ever going to become walkable if everyone just keeps saying "well it's just too hard to have nice things" and keeps throwing money at perpetuating the problem instead of using that money to get out of the hole.