Yes Dick, it is concrete-mindedness. Concrete minded-ness at not accepting the airspace restriction was only one factor in this accident. Concrete-mindedness at not accepting that a change in any one of those factors would probably prevented the accident. Concrete-mindedness at only discussing your airspace concerns in the WLM context.
For at least the third time, why is your passion solely concentrated on airspace? Change any other factor that night, some of which are as 'easy' to change as airspace administration, and the accident probably would not have happened. If your quest is as noble as you make us believe, why no mention of other RA2 airspace, many examples of which are around as inhospitable country as WLM? After all, isn't it about saving lives? Surely a life at East Sale is as important as a life at Williamtown.