Regarding reason 3...fundamental navigation error...I'm no expert in the human factors area, but I've got a hunch that a highly experienced crew is equally prone to making a data input error, and not noticing it, as a novice crew. I don't think experience is any protection against data input errors, and what follows thereafter, simply because that is the way humans are built. We have become accustomed to the computer being infallible and lulling us into a false sense of security against our own fallibility.