I completely agree that if there are tools that can allow a vehicle to "see" better than a human it's absurd not to implement them. Even if musk could make a car exactly as good as a human, that's a low bar. It isn't good enough.

As for humans: if you are operating a vehicle such that you could not avoid killing an unexpected person on the road, you are not safely operating the vehicle. In this case, it's known as "over driving your headlights", you are driving at a speed that precludes you from reacting appropriately by the time you can perceive an issue.

Imagine if it wasn't a deer but a chunk of concrete that would kill you if struck at speed. Perhaps a bolder on a mountain pass. A vehicle that has broken down.

Does Musk's system operate safely? No. The fact that it was a deer is completely irrelevant.