Are you arguing that no seatbelt is better than a paper seatbelt?

Just because the seatbelt is broken, doesn't mean we should abandon seatbelts. It means we should work harder to make better seatbelts.

An argument I see when libertarians are faced with such questions is that libertarians aren't 'against' seatbelts, but they want to explore the alternatives. And yet they don't seem to come up with any other alternatives...