Using that gotcha incorrectly made them look foolish too.
Care to elaborate how exactly? Throughout this thread you've demonstrated a fundamental failure to grasp:
a) the technical barriers to creating a "backdoor" for encrypted data
and
b) the negative implications of doing so
(2) Call me authoritarian if you like but if it's a choice between terrorists and criminals not being able to secure their plans/operations from the authorities as easily or Deno being able to access his pictures of the Ibiza trip on both his iPhone and his iPad safe in the knowledge they can never get leaked online then I favour the option that's actually of value to society.
Congratulations, Deno has just had his identity stolen and house robbed while he was away, because scans of his passport, driving licence, birth certificate and trip itinerary were all leaked online.
Oh, and you caught zero terrorists because their data was already encrypted before uploading (but just in case, they moved all their data to a self-hosted server you aren't even aware exists).
I'm fully on board with giving the police access to data which will help catch bad actors - the problem with proposals like this is that they will not only fail to achieve that goal, but also will hurt plenty of other people in the process.
I fully understand the concept of encryption and worked in what is now called cyber security for many years.
Then you should be familiar with Kerchoffs's principle and the concept of "security by obscurity", and how much of a Bad Idea(tm) it is. If your "encryption" has a "backdoor", then it's not really encryption at all. Your security is reduced to keeping that "backdoor" a secret. All it takes is a disgruntled developer or code leak and it's game over.
The alternative is of course keeping a copy of every user's key, but then you have the same issue - a database leak and goodbye security.
If you're so happy to have your personal data out there relatively unprotected, then feel free to put your money where your mouth is and post some scans of your passport, driving licence etc.