I think at the end of the day, software has bugs. And if you have an extremely well funded and intelligent group (e.g. Equation Group) looking for these holes and keeping them secret for personal use and exploitation rather than fixing them, there are going to be ways for your data to be compromised.
The phone in the San Bernardino case was an iPhone 5C, with the A6 processor. Secure Enclave was introduced in the A7.
https://9to5mac.com/2016/04/07/fbi-iphone-hack-method-secure...
Even if you couldn't infiltrate the chip foundry, you could order a bunch of the chips, reverse engineer them, and in a few months, ship a duplicate with a neutered "enclave". Then interdict the shipment to the phone manufacturer (this isn't tinfoil, it's been done) and "supply" them with your version of the "secure enclave". There's no limit to this cat and mouse game.
Specifically for the US, see: https://en.wikipedia.org/wiki/Lavabit#Suspension_and_gag_ord... and https://en.wikipedia.org/wiki/United_States_v._Fricosu
This is the only sane interpretation, though, as people have more and more encrypted devices, it's unreasonable to punish someone for not remembering a password.
apparently the "All Writs Act" of 1789 is the "constitution doesn't apply to you" trump card.
they just locked up
That wording implies that this "just" happened, even perhaps during the current administration. The court order was 18 months ago, and he's been "locked up" for the past 16 months.https://www.washingtonpost.com/news/volokh-conspiracy/wp/201...
My iPhone is set to passcode unlock instead of fingerprint because of the reasoning you say, but if other courts start agreeing with this one, I'm inclined to change to Touch ID for simplicity :(
There is still the argument that you can be physically coerced to unlock your phone against your will by someone pressing it against your finger, but you can't type in a passcode against your will.
Or better yet, a dead man switch.
Cannot be really held in contempt for having features to prevent coercion.