Isn't the pertinent point here about avoidable risk? Half my working life is spent on 12-hour night shifts [I'm doing it now] and the comments about the scary drives home are as accurate for me as anyone else but if I want to stay in my current employment then such a journey isn't reasonably avoidable.
Surely the difference is that the driver in that accident had wilfully neglected to rest when he had every oppurtunity to do so but chose to stay awake on the phone.