The difficulty is that encryption doesn't work with the warrant system. There's no "encrypted before a warrant is issued, but unlockable after one is" without key escrow or something similar.
The real tragedy is that if the government had good intentions about doing so in a responsible manner (setting aside the problems with key escrow in the first place), then the NSA burnt those bridges to the ground between 1990 and 2015.
The real tragedy is that if the government had good intentions about doing so in a responsible manner (setting aside the problems with key escrow in the first place), then the NSA burnt those bridges to the ground between 1990 and 2015.
Action. Reaction.