If you're a passenger in the back of a car, and the car stops suddenly in an accident, you will be launched into the seat in front of you. Drivers have died as the result of a rear passenger crushing them. Even seat belts can affect others.
Crash test footage of an unbelted rear passenger - https://www.youtube.com/watch?v=y3InF19dzlM
British safety 'advert' about it - https://www.youtube.com/watch?v=lw2aevh6oZ8 (Maybe not for the squeamish..)
This is why people really should wear seat belts in taxis and Ubers.
Just wear a seatbelt and put on that helmet.
That doesn't mean it's wrong, just that I find it wholly uncompelling. And I don't exactly oppose seat belt laws either, I just find this justification, uh, perverted maybe? Bizarre? Utterly unconvincing.
Why would you want to subject your friends and loves one to that type of phycological suffering?
The government mandates liability insurance and also mandates safety features that reduce risk for liability insurance providers.
There are reasonable debates be to had if the lines are drawn in the correct places (if motocyclists have to wear helmets, why not other drivers?).
so maybe you can make the case of not getting into vehicles with unbelted persons, however, children among others, often dont have the choice.
Seatbelts save lives and lower the costs for everyone by not required additional resources be spent on treating people unwilling to wear a seatbelt. Just like vaccines.
Would a "libertarian" approach to motorcycle helmet requirements deny social security disability income or medicaid to persons injured in a motorcycle crash without a helmet?
Similar questions apply to car-crash injuries without seat belts, and to serious disease in people who refuse vaccines.
At any rate, I do a lot of road bicycling in New Hampshire, always wearing a helmet. Some motorcyclists, legally, don't wear helmets. Enough of those same motorcyclists disrespect other users of the road that it's wise to pull over until they pass.
We don't all live in places with less than 100 people per square mile.