What some of you seem to be comparing this to is body work on the car.
Today's decision has absolutly nothing to do with running a flexible plate underneath the car. This is a legal matter that involved one team containing the documents which belonged to another team. Nothing less.
In this situation Mclaren's Chief Designer had in his posession since prior to the start of the season up until the Canadian/American Grandprix confidential data belonging to Ferrari. Whether there was a benefit or not is not the point. You can always disprove such things in court. "Yes we have a similar rear wing to Ferrari's. Wind Tunnel Testing has shown that it is the fastest solution." just like that. Throw a bunch of pages of information regarding the test and bang. Now in no way am I even suggesting that. We are all smart enough and bright enough to understand that Formula One is a much more complex sport than just copy and pasting what someone else is doing to what we are doing and so forth. Indeed the data could have been used in less obvious areas. As people have said earlier discovering the Ferrari's weakness. The leaked Data from the Coughlan letter to Ferrari seem to suggest more than one person knew about this. Another important situation has also been brought up today. The only reason that Mclaren are looking into the matter is because Ferrari brought it to everyone's attention a couple of months ago. If Ferrari hadnt started the internal investigation Coughlan and Mclaren would still be in posession of these documents. As Coughlan would still be employed and working day to day on the Mclaren.
Anyway thats just the beginning of it. I have much more but little time to discuss this stuff right now. Its very disappointing what has happened today. What the FIA has done instead is reward big business. Ferrari, Mercedes, BMW, Honda, etc, would have required much more information in court to be proven guilty. But I bet a team like Spyker or even Super Auguri would have been kicked out of the championship.
What we have seen today is The FIA bending over backwards. A team has CLEARLY Cheated in the most disturbing way possible (Through the intellectual property of another team) and has gotten away with it. At best a two race ban for the Mclaren team would have been appropriate. Because at the end of the day, A McLaren employee had in his posession intellectual property belonging to Ferrari, with no intention of getting rid of it. Whether it was used or not is what Paper Shredders were made for.