No one has said what caused the accident - the aircraft going IIMC then, I would suggest uncontrolled Flight Into Terrain was the result of a chain of events and decisions that need to be traced back to conception for us all to learn.
I would suggest that the majority of us can give an educated guess as to why the aircraft crashed - the weather was a factor but it did not cause the crash.
It will not be the first crash where the pilot made an error of judgement - alledgedly ...........