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I guess I don't understand how.

> A navigation mechanism, as on an aircraft, that automatically maintains a preset course.

Applies here. As far as I can tell the system did do exactly that. But the details of the actual event are unclear (I've heard parked car but also just hitting the back of another car?)

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It’s an emergent technology. The onus is on Tesla to be crystal clear about capabilities, and consistently so. People might quite reasonably infer that something which is labeled as “auto-“ or “automatic” doesn’t require supervision.

Such as automobile?

Automobiles are self-propelled, not self-navigating. They don't rely on horses to pull them.

automobile: self-propelled (self moving)

autopilot: self-piloting (self navigating)

https://www.ahdictionary.com/word/search.html?q=automobile

Indeed, since you do not need to externally supervise the drivetrain in a car.

It didnt maintain the course. It kept going at a t intersection and ploughed into another car

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