‘The dead govern the living.’ –Auguste Comte
Aircraft are an interesting set of examples because they’re so well studied and corrected. We don’t spend time correcting hospital mistakes with nearly the speed and detail we do aircraft accidents, for example.
It used to be that airliners broke up in the sky because of small cracks in the window frames. So we fixed that. It used to be that aircraft crashed because of outward opening doors. So we fixed that. Aircraft used to fall out of the sky from urine corrosion, so we fixed that with encapsulated plastic lavatories. […] And so we add more rules, like requiring two people in the cockpit from now on. Who knows what the mental capacity is of the flight attendant that’s now allowed in there with one pilot, or what their motives are. At some point, if we wait long enough, a flight attendant is going to take over an airplane having only to incapacitate one, not two, pilots. And so we’ll add more rules about the type of flight attendant allowed in the cockpit and on and on.
There’s a wonderful story of the five whys.
The Lincoln Memorial stonework was being damaged. Why? By cleaning spray eroding it. Why? Because it’s used to clean bird poop. So they tried killing the birds. Didn’t work. Why are the birds there? To eat insects. Let’s kill the insects! Didn’t work. Why are the insects there? Because the lights are on after dusk. So let’s just turn the lights off. That works.
