Large companies in the US, especially at the current moment in history, have huge amounts of power vested in individual executives.

If those executives valued not being incompetent in any specific given way (especially in the ways that harm the many), they have the power to change that. They can say "no, we need to make sure this never happens again."

The fact that they choose not to do that, in so, so many cases, has a variety of causes, but in the end what it fundamentally boils down to is that they choose not to do it.