Earlier quoted context omitted.
Yes, people should drive cars that don't produce such a large amount of noxious fumes, they should drive less -- cars are the number one accidental killer at 40k deaths/year in the US. Both of these things would naturally occur if drivers were not free externalize the significant costs of their personal choices.
It's not about those wasteful car drivers "externalizing the costs of their personal choices." Please! Most people have no choice, because of how the entire country has chosen to invest in infrastructure. Which is to say, it has chosen not to. American physical geography and sociopolitical geography forces car driving.
If the costs were not externalized, market and political forces would dictate changes in both personal choices and infrastructure investment.
I don't see the rational for abdicating responsibility for the choices in where we both live and work, as disclaiming responsibility for the externalities incurred by these choices ensures that a more optimum "sociopolitical geography" will not be reached.