A professional pilot must recognise the limitations of his experience, currency and training (I know, easier said that done you may say - but true nevertheless).
Being one of those KOSs, I have had a number of occasions in the past when over-confident & very forceful passengers have insisted in attempting landings at private sites below limits, 'finding a hole in the fog', etc, etc, and the only answer is to politely decline the unsuitable request.
We must try and find a way to get the message across to those who have not yet had the chance to accumulate the experience & confidence that goes with it (and in a few cases of those who have the experience & should know better) to stand up to unreasonable demands from passengers.
The whole industry is greatly damaged by wholly preventable accidents such as this, together with the enormous distress to the families and friends of all those involved.
Thorough IF training and regular recurrency is a must if you are going to fly in poor weather. The helicopters are fully capable these days and so must be the pilots.