The problem here is those with money who fly as pax do not have the risk mindset of many pilots. In this case single engine, single crew, over water, at night, no immersion suits, operating outside a organisational safety framework which is likely to be in place in larger organisation such as an airline or the military. Added to all this the pressure to get there by the wealthy client or operate in and out of less suitable airfields or landing areas., all of this we have seen before. It would be interesting to see the forecast for this route at 5000 feet, what were the icing conditions, and what icing conditions the aircraft type is cleared for under ' public transport'..