Excuse the pun, the main problem (besides the obvious bias issues)on here is that everything is always put into such a black and white perspective. Little to no nuance. Ranieri and Molinaro aren't always either terrible or brilliant, there is a middle ground.
Ranieri made a few mistakes(one which was forced upon him even) against Roma even, but tactically he outmastered the much praised(in italy anyway) Spalleti, with an offensive storm in the first half and he shut them down defensively in the second. Roma weren't that dangerous in the second 45 minutes.
Also I thought Molinaro AND Zebina played well. We only had three players in the centre of the pitch, so it was logical that the Roma wingers and fullbacks would have more space. It looked me like a calculated risk to me though, as we chose to close down Pizzaro and De Rossi, effectively cancelling out their build-up play and tempo-makers. Mancini, Taddei, Tonetto and Cassetti saw a lot of the ball, but they all had shockers. I reckon that Zebina and Molinaro at least deserve some credit for that.
Also, when you insist on highlighting the mistakes and poor crosses Molinaro for example makes, it's only fair to also highlight the positives of his game.