Consumers by in large know driving is dangerous and safety features are something car manufacturers advertise to consumers. Not to mention over the last 30-40 years drivers have come to expect these sorts of features in cars because accidents happens and those features increase survivability, by a lot.

The same sort of consumer expectation doesn't exist for no-javascript. Major browsers default it enabled. The web has developed to be seriously built on top of javascript for the last 15 years. Consumers have expectations for how the web should work in 2017 (for better or worse) and no-javascript isn't anywhere on the radar.

Consumer expect cars to have airbags and seatbelts, consumers expect websites to behave as they always have and that means javascript.