Perhaps you have not read the findings of the Investigating BOI
Well Caz, in view of all the other matters that the BOI was misinformed about, it would not be surprising if they got that finding wrong too. What they didn't get wrong, although two senior officers overruled them, was to blame the crew.
However, assuming there will be a truly independant enquiry in possession of all the facts (suppressed at the time) that have emerged since, a more accurate verdict may be arrived at, and blame properly apportioned.
I am sure the Provost Marshal will take a close interest in the proceedings.