When someone or the team is losing, there's a lot of psychology involved. I don't doubt for a second that every one of the Broncos players wants to win - No one likes to lose, especially professional sports players. The problem comes when they start to hit the wall or make a mistake, get down on themselves or the opposition team scores points. This is where mentally, they're lacking.
You see it in Ben Hunt. The kid has all the talent and potential in the world - He's done some tremendous things on the football field that had us all going, "This kid could be the next Langer." Then, for whatever reason, he has 2 shockers in a row, one which was deplorable, let's be honest, then his last game was only just passable by first grade standard. Why is this? I think he's mentally weak at times. This comes down to man management and having a good sports psychologist for the players to talk to. Put yourself in his shoes for a minute - You've been playing 20 minutes a game as backup hooker for 3 years, now you've got Alan Langer's number on your back and the weight of the entire club and its supporters on your shoulders.
It's extremely possible to overcome. There are techniques you can use to overcome these issues, but one has to ask, is this being addressed?