really depends on when the vehicle manufacturer knew of the fault...if they knew about it 6 months ago and then still sold the car with the exploit still possible ,without letting the end user know, both are at fault.
No.
Manufacturer knew about it, kept it a secret and worked with others to fix it. They send out updates to all cars (and notify the public at the same time) and nobody ever dies because the problem was dealt with.
Idiots still want to sue the manufacturer over deaths that never happened.