From Crab -
Your attempt to make a science of VR is pitiful and, whilst there are visual traps and illusions (scale, goldfishbowl and hidden ridgelines for example) the fact is you can either see where you are going or not. If you have to descend below your minima to keep visual then you should turn back or land or divert using a bad-weather plan - this is not rocket surgery.
What we are dealing with is poor decision making, not whether there are enough visual cues to control the helicopter - that happens after the poor decisions are made and the sucker keeps on going.
I think that just about covers it nicely. Poor decisions, poor captaincy and poor airmanship are the problems.
VFR is VFR, let's not try to complicate things any more. If anyone is having to fly low and slow in order to maintain VMC then it is time to reconsider why you are there.
Tam