I have to agree with both points raised by D246 and Ark. D246 is correct in stating that
Whatever may have happened they put themselves in a position from which they were going to hit the mountian regardless, you cannot fly into those conditions at that speed, full stop
and so consequently the cause of the accident must rest with the aircrew....BUT
before dead people are found guilty of gross negligence, that negligence must be proven to the standard required by the RAF's own rules in force at the time.
is also correct.
They may have caused the accident but they were not Grossly negligent.