When I worked in designing computer systems (user interface), I always kept human error in mind. I studied perceptual difficulties as well as natural tendencies to overlook patterns, to forget things, and to allow our attention to wander. I took fatigue into account as well as attention span. I made things easier for people not to fail at what they were doing.
In computer systems human error usually does not result in death but we have seen many instances of human error with train wrecks, ship wrecks, plane crashes and car accidents. Yet, if we let ourselves become stressed over every possible case of human error, we would be paralyzed with fear.
And so we go about living our lives in trust that some huge mistake won’t impact us negatively. We trust that most terrible mistakes will not happen and that we can deal with the aftermath of the errors that do. Otherwise, we’d be constantly frightened beings living shortened lifespans due to the amount of stress hormones we are inflicting on our bodies.
Human life would be a sorry event if all we did was think about about all the things that could go wrong. But the Universe is not subject to the effects of human error. Therefore no matter how many mistakes people make, it doesn’t matter one iota to the Universe.