Framer.
I quite agree.
I've also worked some utterly exhausting rotas, and the exhaustion certainly built up as the days went by- but it was manageable most of the time. Add in filthy weather, first time to a new (Captains only landing) destination and in my own case anyway, an attempt to also have a life outside work....and it can get a little much.
In the case of this crew, they must have known as they shot this approach that they were looking at use of discretion to complete the trip, and that they would be flying for around ten hours. Not to mention their other duty time.
We all know that flight crew are an expensive resource, and that maxing out their FDPs makes good business sense......but knackered crews make mistakes.
And those are expensive too....