I wonder if they just put the wrong airport in the FMGC?
Otherwise it seems completely bizarre that none of the crew, cabin crew, etc. had any idea that the clock was ticking and they were very late on arrival time. As for fuel, I wonder what they landed with. I suspect they had some extra fuel on board, very lucky for them or the news story could have been somewhat different.
If it was a "heated discussion" that caused them total distraction from even the most basic checks (such as aviate, navigate, communicate) then for sure I hope they get the book thrown at them.
But I suspect there is more to this story......