In some ways that is the answer. Crashes keep happening because they are not being held accountable to regulators because they are not reporting these incidents and no one is exercising oversight to be sure the reporting matches reality.

I think over the years, accurate reporting by manufacturers has been done because they generally do not want to be known as that car company that killed a child and it could have been prevented with a 50 cent bolt. As a result, regulators have been less hawkish. Of course there are probably political donations in the US to help keep the wheels turning.