Chinook.
Airborne Aircrew. Do try to keep up; the negligence was in fliyng towards and eventually into IMC when the hills were (according to all ten witnesses on those hills, incluing trained observers) undeniably in IMC.
Why the crew did so, as I have said several times before here, we shall never know, and I do not know either; but I have offered a reasonable explanation; and noone has refuted that possibility. But that they did indeed plough into granite, was a consequnce of this negligence. I am sorry if you are unable to follow that logic.
With all good wishes. JP