Baloney. Nobody has "been caught" fixing an NFL game. I'm not saying it's never happened in the history of the game, but what you say is factually WRONG. If you are going to make a point, you have to start with the truth. If you can't state the truth to make your argument, then your case must not be strong.
Again, there were calls that went against Pittsburgh despite your denial and selective memory. On a 3rd-and-long, Pitt threw a pass downfield for an incomplete pass, only the refs threw a flag on Seattle for "helmet-to-helmet" contact. That would have give Pitt a FD in Seattle territory. Only the refs picked the flag up and Pitt had to punt. The replay showed that it was close and they certainly could have called it had they wanted to stay with the initial call. Who knows what would have happened had they given Pitt a FD. Maybe the Steelers score a TD, instead of punting. Jeremy Stevens fumbled the ball after making a catch, only the refs blew it dead and called it incomplete. The Steelers would have recovered the ball and did what with it? Who knows?
I don't consider getting the call correct, as going against Pittsburgh. Name the calls that went AGAINST Pittsburgh.
I never said NFL games had been fixed, just sports events at very high levels (MSL baseball blacksox, Cleveland State basketball, Boston College b-ball to name a few); why would you believe the NFL would be somehow exempt from that? The mere fact the NFL referees are completely screened from public/private scrutiny (as poster Diplomat correctly stated), would make it all the easier for dirty refs to ensure an outcome they wanted. Players and coaches who even hint at official malfeasance (except Pittsburg's Joey Porter... SURPRISE!)(Not), get fined or suspended. Media types would be banned from press conferences for suggesting such a thing.
As far as your example of the helmet to helmet hit, even in real time it looked to me like the defensive back hit the receiver in the back, not the head. Replay clearly showed it was a legal play, and that is why the flag was picked up, it was not a very close call. In fact, that is another example of a questionable call being made against Seattle.
I'd challenge you to name even 1 crucial (crucial = game changing or took points from the scoreboard) call that went against Pittsburg. I can name several that went against seattle, and have already done so.
How about the non-horse collar call that was never called against Pittsburgh-
Or the delay of game that never was-Refs allowed Pitt to take a timeout- on a critical fourth down play.
The non-review by the refs under two minutes of Darrell Jackson's catch, one foot down and the other hitting the pile-on. ( Touchdown by rule and not challengeable by a team under two minutes)
Anybody remember those?