I suspect the extend and target of postmortem blame varies considerably from culture to culture. An anecdote from the railroad traffic between Germany and Denmark:
"[In 2019, a DB Cargo freight train in Denmark caused an accident with a passenger train on its way to Copenhagen after a truck trailer flew off the freight train due to high winds. The German side was keen to find out who was responsible at the lowest level, i.e. the wagon inspector who had not adequately secured the freight on the freight train. The Danish side didn't care, the local authorities were concerned with structural responsibility. Not who caused the accident, but why could it happen! So in Denmark, the motto is: the process is the cause.]"
There are some old stereotypes of detail-obsessed Germans - far too busy measuring the growth rings of a tree with micrometers, and wondering why those are so close together - but never noticing that the tree is small, and growing in a well-shaded part of a large forest.
Not that surprising. The wagon inspector was a dane in denmark. The organizational responsibility was on german leaders in a german company. In the end nothing happened.
Matt Parker of Youtube fame also wrote a book called Humble Pi: When Math Goes Wrong in the Real World which covers several post-mortems from the engineering space.
I found it interesting that he compared and contrasted the airline industry where failures are seen as systemic (don't blame the pilot, blame the system) and the medical industry where failures are typically seen as having personal liability (blame the surgeon).
Same here, I hadn't tried HTTP. I wonder if this is Plusnet conforming to the letter of the law in quiet defiance? Of course, it could just be an error on their part...
"[In 2019, a DB Cargo freight train in Denmark caused an accident with a passenger train on its way to Copenhagen after a truck trailer flew off the freight train due to high winds. The German side was keen to find out who was responsible at the lowest level, i.e. the wagon inspector who had not adequately secured the freight on the freight train. The Danish side didn't care, the local authorities were concerned with structural responsibility. Not who caused the accident, but why could it happen! So in Denmark, the motto is: the process is the cause.]"
- https://www.wiwo.de/unternehmen/dienstleister/zugunglueck-be... (German source)