Nigel,
The specific complexities and CRM are secondary to the root cause of the crash. All other elements including the non precision approach, incorrect briefing (prior to landing) high sink rate etc all are rendered inconsequential IF the pilot exercises his command authority and adheres to recognized SOP and common sense at the critical moment. SadPole hits on the underlying complexity due to having both the President head of the Air Force on board. However as long as the PIC is strapped in the pointy end he is the aircraft commander and has both the authority and responsibility. My comment is about the root cause and responsibility...not the benefit of analysis for the sake of learning and safety.
All to often I think the root cause is somewhat hidden in the complexity of circumstance. If we look at recent crash in Lebanon the "real issues" are simple.
1) Do not pair low time (in type) captains and first officers
2) A lack of hand flying proficiency and insufficient unusual attitude training will kill you sooner or later if you fly enough.
3) Automatics aren't always automatic. Regardless of workload the "pilot flying" is just that...even if George is driving the bus.
At the end of the day if you take the aviator out of aviation you eventually get bent and broken aluminium...