Some sharp cookies on this thread.
It's bleedin obvious that the pilots cocked up the GA and the resulting issues so well done for all the smart arse 'they were incompetent' posts, brilliant deduction Sherlock.
WHY did it happen?
Both pilots are experienced, have achieved at least minimum 'company standard' on every sim/line check but they still cocked it up. If it's a training issue then this company would have suffered with similar (although perhaps not as critical) cock ups but they don't.
The bottom line is the two pilots aren't usually incompetent so why were they on this particular day. Until that is answered then you or me or any of us could find ourselves in the same boat no matter how many times we've manually flown a raw data approach ffs!