From what I understood it is not about the isps having keys to unlock a copy of the data they store (of course they will), what it is revolves around anyone implementing any security software on any device (whether this is as part of the windows-linux-android-apple operating system, or an application like email) will have to present that software source to the government and let them fiddle with it to make sure that the government can hack your solution and read anything from anyone at any time... including your emails, porn history, company documentation, banking data... everything.
We know that security systems are not foolproof and do get hacked (we did it in the '40s, and kept it quiet for decades), but when they are deliberately broken and the user is not aware this leads to all sorts of unpleasant thoughts. I suspect the NSA is already perfectly capable of reading anything sent via secure email on any American based product.
Biting the hand that feeds IT
