Hi RF4.
First, thanks for a quick and well-written response re my comments on your comments.
I agree with everything you say, except for a difference we have in what constitutes "contributing factors". I especially agree with your assertion that poor planning and poor execution are often the underlying causes – even in weather related accidents.
But, in examining the “why and how” of an accident we must (IMO) include contributors to the chain. So, if poor planning and/or poor execution leads a crew into a situation where they hit terrain that that didn’t see in time to avoid (mountain top obscured by fast developed cloud, vis drops significantly in haze or rain shower, etc. then the poor planning / poor execution is a prime factor and the weather would be a contributor.
So, I think we agree in essence. I am simply considering a longer chain of causal events.