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This line of argument hinges on the assumption that braking input is the only means by which to avoid an accident. Cars have steering wheels and swerving is often an effective maneuver when attempting to avoid an accident.

Incidentally, heavy breaking reduces a car's ability to corner which may end up causing accidents which could otherwise be avoided.

At below 22mph or whatever they said, and at the distances they show in the movie, I'm almost positive that braking is the correct action. In that situation, stop distance is short and it's too late to swerve. (It's true that swerving becomes a progressively better option as speed increases.)

Especially considering the difference in injury for a rear-end accident versus mowing down a pedestrian. Even if we assume that 100% of the time the car behind you will hit, the death toll is still likely much reduced.

This would be "certainly" only if the system worked perfectly. I think there will way more false positives than actual preventions (at least in the near term).