Steven Levitt 2, Surprising stats about child carseats

TEDGlobal 2005
Steven Levitt 2, Surprising stats about child carseats (script)
Summary
In our modern world, driving a car is usual, but car accidents sometimes happen. No matter what happens, you just want to save your child from the car crash. Thus, many people use the car seat. However, it's very expensive and it's very complicated to use.
Are people happy and satisfied to use it? Is this so cost-effective?
The speaker strongly says that using the car seat has absolutely no meaning whatsoever. There's statistically insignificant differences in injury between car seats and lap-and-shoulder belts. He has some evidence from tests and data.
However, people continue to use the car seat even if it's very expensive and it's very complicated to use but the fatal accident happened. The government also agrees to use it, even if its tests don't have 100 percent score to be safe.
He says many times that it's not so clear that it is so cost-effective.
I think about this problem, people can't compare whether it's so cost-effective or not.  It's because it relates deaths of children especially . People who lose their children in a car crash want someone or something to be responsible for it. Thus, the car seat become the best equipment. If children die in car crash, you can say that you installed it wrongly or in the test, it didn't say that 100 percent can help. There are many kinds of accident patterns. You can also say this to parents who don't use it, "Children might be able to be helped if you use it." That will be told to the children who were helped. All thanks to the car seat.
Thus, if it's not so clear that it is so cost-effective, people continue to use the car seat.
Words in this story
fatal /fa・tal/féɪṭl/ causing death.
fatality /fa・tal・i・ty/feɪtˈæləṭi/ an occurrence of death by accident, in war, or from disease. helplessness in the face of fate.