The term accident is a magic word in the sense it's got like two definitions that contradict with eahch other. We're focused on what a person did and whether they did it wrong or not. The science of how you prevent harm has nothing to do with what one person did wrong, especially at the very far end of the chain of events. But all this is just a way to ignore layerd, causality, a and harm reduction - which i always try and turn people back to.