Apple looked at the pen register cases and realized the best position to be in as a third party is to not possess usable data.
The US case from my point of view is trying to fore Apple to share user data with third parties.
I don't agree. NSA can hack/pressure smaller companies much easier than a giant like Apple.
[0] Because, among other things, the whole "Surprise and Delight" doctrine demands internal controls and secret-keeping discipline not that far off from an actual intelligence agency