Why should people not be allowed to make that choice?
Keep in mind that the only reason we have airbags is because Naderites did not believe that one could rely on people using seatbelts so there needed to be technology that did not require cooperation from humans.
Fast-forward a couple of decades. Oooops. Airbags have no use without seatbelts and provide only a small amount of additional protection in most cases (thanks to crumple zones and improvements in shaping the interior of the car).