@ PBL:
there is however, a chain of events leading up to an accident.
Removal of any of those links prevents the accident.
So reminding ourselves that airmanship is our last resort even when the rest of the design and circumstances conspire against us, is not a bad thing in my opinion.
Fact is, that without the decision to change a good plan, none of the other factors would have been able to cause the accident.
They probably would have been part of another chain of events, leading to another accident or incident, but not this one.
So for us at the pointy end of whatever we fly, design of aircraft, equipment and airspace are a given that we cannot influence, only our behaviour and how we work with what we are handed on the day.
In this case, as in may other cases, the crew made poor choices allowing the rest of the holes in the swiss cheese to line up. And as human beings, we need awareness of why and how we are prone to making poor choices. Because we will always have to deal with stuff designed by people without the full picture of what it means to work with it. We are always the last line of defence.