What they SHOULD say is "of course our autopilot system is supposed to be able to detect that a truck has turned in front of you, we don't know why the system failed but we will put every effort into improving it so that nothing like this ever happens again.
Instead of trying to find ways to blame the driver and pretend that autopilot means no one will never take their eyes off the road they should say "mea culpa - our system failed, we take responsibility and we will fix it - and we will pay damages"
What is more important to deal with autopilot the way it will be used in the real world and protect public trust or to protect themselves from ONE count them ONE little lawsuit
They're idiots. They will not sell more cars. They don't deserve to.