> Maybe single occupancy personal vehicles are wasteful and mass transportation should be invested in rather than shaming individual

no amount of shaming will make me not consider my family's safety. mass transit in CA (eg: https://www.opportunitynowsv.org/blog/nobody-feels-comfortab...) is not safe due to lack of serious policing. my family is prohibited from taking mass transit in usa. It is ok in japan and singapore.