Who knows who decided to push on? Probably just the pilot, and he doesn't like to talk about this one. Very lucky to have landed in squishy mud - if they had not gotten disoriented and spun out of the fog, they might have cleaned up the 2GB mast further along track.
Another causal factor was the lack of IF training for the NVFR pilot, and minimal instrumentation.
A sad ending to this accident was the suicide of her husband who caused the car crash in the first place.