The point (which many people missed) is that there should be a process or tooling in place to make it hard or ideally impossible for a mistake like that to comp

The point (which many people missed) is that there should be a process or tooling in place to make it hard or ideally impossible for a mistake like that to completely disable the system. And that it is normal for humans to make mistakes every once and awhile. If the system can't deal with that, then it's not a robust system.