I worked for the FAA on these sorts of Risk Analysis Panels when I was younger. It's basically a trade-off of the likely damage or impact (a rating something l

I worked for the FAA on these sorts of Risk Analysis Panels when I was younger. It's basically a trade-off of the likely damage or impact (a rating something like stubbed toe to everyone on the plane dies) vs the chance it will happen (once a day, year, 100 years, shouldn't ever happen but can maybe possibly). An example of this is babies in laps on airplane. What is the benefit? People with kids will fly rather than drive. But are kids safe on a parents lap? No not really? Are they SAFER on a parents lap in an airplane than in a cross country trip in a car-seat? It turns out they are. So you have babies in laps on airplanes. It's an analysis of safety not a mitigation of situations where people might, with extremely low probability, die.