As far as I can see, particularly on the Kiwi side of the pond, "safety culture" and "GA" are mutually-exclusive terms that cannot be used in the same sentence.
Don't know much about CASA, but over here the CAA deserve much of the blame for steadfastly refusing to hold operators to account. They just assume that operators are playing by the rules unless there is overwhelming evidence to the contrary. We all know how well that approach works...