Why the "no interception" call in the Pitt-Colts game was the worst call ever

UPDATE: The NFL looked at it my way and didn't fine Joey Porter.

So, in Sunday's maddening tense game (so tense one fan had a heart attack) between the Steelers (my team) and the Colts (nobody's team), with time winding down and the Steelers up by 11, Tory Polumau (sp?) intercepted a Peyton Manning pass. However, the Colts tossed out their challenge flag. Upon further review by me and the rest of the world, it was clear that the interception was made and he fumbled while trying to get up and run with it. However, one official, after five minutes of review saw it differently and reversed the call. The NFL later said that the call was a judgment call. Then, later the same day, the NFL did something that it rarely does, and admitted the ref made a mistake. Now, whoopdie do, the ref made a mistake. It happens all the time, right? Well, not so fast. This mistake wasn't made in a snap-decision judgment call like a Pass Interference call or the like. This was a decision that took several minutes to make and was with the aide of a video evidence. This decision meant that there was conclusive video evidence of a non-catch. However, Troy clearly had both knees hit once when he had possession, he rolled over (still with possession mind you) and then started to stand up before the ball was knocked out of his hand by his knee. Because this call was a calculated call, and not a snap decision, this was the worst call ever by a ref and Joey Porter should not be fined for questioning whether the refs were cheating.