Bringing morality into an economic, fluid dynamics, and behavioral argument is not helpful, and the private car entitlement (which is demonstrably unaffordable and unfunded long term) is wild.
https://infrastructurereportcard.org/
https://pirg.org/articles/america-cant-handle-more-highways-...
https://usa.streetsblog.org/2020/04/13/we-could-never-afford...
https://taxfoundation.org/research/all/federal/road-funding-...
https://en.wikipedia.org/wiki/Highway_Trust_Fund
https://www.nytimes.com/2015/01/03/business/energy-environme...
This causes all kinds of problems, has all kinds of causes, and is generally a disaster all around, but at the very least we shouldn't deliberately make it worse by also artificially juicing demand in one of the main fossil-fuel-burning sectors of the economy (any more than we already are). Every petroleum-powered mile not traveled (and energy is to a certain extent fungible, so in principle this also applies to electric cars burning "free" solar energy) is a win for human civilization.
This isn't hippy-dippy environmentalism, just soulless Chicago economics: mispriced commodities do real damage to a political economy, and in the globalized era, there is effectively only one political economy anymore.