It's more about what the autopilot didn't do than what it did do. It did drive straight ahead into a concrete barrier. It didn't see the barrier. If it had seen

It's more about what the autopilot didn't do than what it did do. It did drive straight ahead into a concrete barrier. It didn't see the barrier. If it had seen the barrier (as is reasonable to expect), it wouldn't have driven into it. Thus what it didn't do caused what it did do.