I dont think you have to be a miserable person to think the Cowboys will lose to Tom Brady considering the team just got curb stomped by Washington's practice squad.
In fact, if you look at Reality's poll, currently 54% of this board is predicting a loss.
I think a fan can logically look at a game and predict a loss without being a miserable person. Doesn't mean you are not going to root for the team. I mean, I was rooting for TCU to win the other night as I have friends that are TCU alumni, but I predicted a loss on another board, felt Georgia was just overall better.
Same way with the Cowboys, I am going to be rooting for a win of course, but I predicted a loss in Reality's poll. Does that make me a miserable person