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The safety features are worth millions of crashes prevented and thousands of lives saved, making them remarkably cost-effective.
Capping the luxury features and size of passenger vehicles would do a lot more to bring down costs than removing safety features.
These were evaluated on a cost-effectiveness basis before being mandated. They are cheap and work.
What makes vehicles expensive is that its much more profitable to sell a huge luxury vehicle instead of a mid-sized sedan. So automakers build giant trucks with fancy interiors instead of cars the typical person can buy new.