All the evidence currently available would appear to point to an "avoidable" accident!
FTDK - Aren't nearly all aircraft crashes avoidable? There but for the grace of God, go most of us. We've all made bad judgement calls, and some of us have survived by more arse than class, and some of us haven't.
Des obviously made some bad judgement calls, we'll never know what was driving him, to press on in deteriorating WX conditions.
One thing is for sure - only those who know WX conditions very well, and study developing WX intensely, between departure and destination, are the ones who are most likely to survive and avoid trouble.
The important thing is to drop all other priorities, no matter how important, and land quickly when you run into conditions which exceed you and your aircrafts capabilities.
All too often, pressing engagements, tight schedules, and other daily demands assume a priority over the major priority - that of reaching your destination safely, in one piece.