You are making the serious suggestion that a significant portion of the average cars cost is artificial in order to make people not buy them? And the extremely powerful automotive lobby is just fine with this?
It isn't unheard of that business will collude with government to "pull the ladder up behind them". I've worked in companies where that has been their stated strategy.
if i am a hardcore environmentalist, i throw regulations at cars to make prices eye wateringly high. car makers are aligned due to ensuing profit
if i am a hardcore environmentalist, i throw regulations at homebuilding to make housebuilding excruciating. homeowner voters are thrilled by the ensuing valuations