As much as I dont feel it was the right decision and I do think what you said is right.

Nobody even at Monza seemed to know the actual rule on it so if anyone did do a "illegal" overtake then they would sit back for a few seconds to make it obvious that they had held back, personally I think Hamilton done enough and if the Ferrari wasn't quick enough to hold him off down that straight then its tough, the muppet still stacked it anyway which was clearly Mclarens fault for even being within 10 miles of them