I wasn't imagining a car spinning out of control. Being trapped inside a car indefinitely is dangerous: you could get carsick and have to throw up, urgently need to use a restroom, have a painful leg cramp that causes a lasting muscle injury, miss picking up your child from school, miss your appointment with your probation officer, be unable to obtain essential medication, suffer from heatstroke, or die of dehydration. An adult should never need to "call human operators" and ask their permission to get out of a car. Unless they're being arrested or something.

And if you hear that the car has run over a child that the operator didn't notice and is dragging it down the pavement under the car, it's essential for you to be able to hit the E-stop button rather than calling an operator to eventually stop the car.