Thanks to risk compensation, making things "safer" doesn't necessarily improve safety. What are the odds that people drive their kids around more (increasing their risk) because having kids in car-seats reduces the perceived risk? How many of those people do you think can point at what the reduction in risk due to car seat use is [0], such that they compensate that risk "rationally"?

[0] Hint: As our sibling conversation shows, that's a non-trivial question.