This seems very absolutist. If we assume the technology exists to make this safe, there are a number of factors that would make this obviously less risky: 4 pe

This seems very absolutist. If we assume the technology exists to make this safe, there are a number of factors that would make this obviously less risky: 4 people per aircraft reduce the number of lives at risk from any particular issue. That doesn't mean the FAA can be 100x as cavalier as they are with an A380, but it does mean the worst possible likely outcome is not as bad. Short flights - easily predictable weather patterns. Elimination of pilot error - obviously replaced with computer error, but still. And as I said elsewhere, the ability to test to destruction.