I understand the desire of people in gov agencies to have more access to backdoors than they currently have, but think for a moment the risks that such powers pose to the public when the government itself turns authoritarian.
Unthinkable in our current climate, maybe. To the left and right of you -- at the NSA or FBI -- everyone is a non-partisan patriot who wants a color blind utopia of freedom and democracy.
I would argue two points: (1) That an apparratus has already been built that is beyond the wildest dreams of prior authoritarian states. (2) Democracies are historically rare and notoriously short lived. They do not last.
With points (1) & (2), we can conclude thus that the powers of such government agencies WILL one day be used by an authoritarian regime. It is a question of when, not if. Let us not build the authoritarian tools so as to not tempt a future would-be tyrant.
The condition upon which God hath given liberty to man is eternal vigilance...