What a strong article.

I want to add one further point.

I've been reading about plane crashes since the 1970s, as one of my very many interests, and as you are aware, we have seen the safety rate improve almost monotonically during that whole time, as we humans systematically eliminated almost all forms of known mechanical, design and procedural failure.

Cancer has been with humans since the dawn of time, but it's only been in the last century or two that we lived long enough for it to be a huge cause of death.

In much the same way, eliminating almost all non-human forms of error in the aviation industry has brought into sharp relief the role of human failure, which, as you also have commented before, is now the chief cause of aviation accidents, and with it, the role of pilot mass murder/suicides.

What I am getting to is this rather grim fact: this means that likely some of the un- or under-explained air crashes of the past were actually murder suicides, given that only recently did authorities become aware that this existed at all.