The letter only shows Apple's point of view on the issue and does not take into consideration why the European Commission ruled the way they did. The only facts presented help Apple's case.
Also while some of Apple's motives are clear with releasing the letter, the main reason for his letter is to save face in the public eye. As we do not know all the facts of the case, it makes me wonder if they are hiding any information or are leaving certain facts out.
It could certainly be a possibility seeing as how the