And when it becomes organisationally normalised that one layer of safety isn't working and the remaining ones are relied upon, then that's more like the subject

And when it becomes organisationally normalised that one layer of safety isn't working and the remaining ones are relied upon, then that's more like the subject of Normal Accidents [1] [1]: https://en.wikipedia.org/wiki/Normal_Accidents https://en.wikipedia.org/wiki/Normal_Accidents