Because those vehicles have licensed human operators. The malfunctions may be to blame on the manufacturer, but are also licensed and regulated. The cars have to pass certain crash test standards for example.

In this case, the operator was an AI that was negligent and it was unlicensed/unregulated. That's a new scenario. In the human case a person might go to jail for negligent vehicular manslaughter. What does 2 years of jail time look like to an AI? What does a suspended license look like to an unlicensed entity?

I’m specifically talking about the case where the operator is not at fault.