The entire video is Autopilot in city driving. Autopilot, at this time, is only for "driving on dry, straight roads,
such as highways and freeways. It should not
be used on city streets."
There is precedence that "it's up to the user" is not sufficient as a societal standard for what is legally allowed. (For example seat belt laws). It is reasonable to ask: "Should we allow such a feature in cars on our road?" For example, what if the car had struck a cyclist rather than a truck and the fatality went the other way?
You are not legally free to do all dumb shit. For example, you are not free in many states to ride around without a seatbelt on. Car makers are not free to make cars without seatbelts.
That's the precedence.