Ratings. The ball hit the ground. Is everyone blind? End of story!!!
Do you understand the rule?
Even insufferable Pats fans are saying the Steelers got screwed. You are missing the point. Even if you are correct that it is the right call as per the letter of the law, the letter of the law is so beyond stupid, it's infuriating.
Just think - imagine if instead of the fumbling the ball as it hit the ground, a Pats defensive player would have knocked the ball out of his hand. It would have been a touchdown- not an incomplete pass. He caught the ball, made two steps, knee was down, forearm was down - he established possession, completed the catch and crossed the goal line before the fumble was caused. However, because he landed and the ball came out 10 minutes after all of those things - no catch. How stupid is that?