Unless your "adversary" is not the NSA, I wonder what's the point of encrypting your communications when those coms are taking place on technologies (iOS, Android, Chrome) from companies that are members of the Prism program.
2. You should learn more about PRISM before spreading FUD about its victims. I'm strongly critical of the NSA's actions but for all of their abuse, PRISM is not the bogeyman you're making it out to be:
“The PRISM program collects stored internet communications based on demands made to internet companies such as Google Inc. under Section 702 of the FISA Amendments Act of 2008 to turn over any data that match court-approved search terms”
Remember, this a secret court, whose judges are likely highly biased in favor the government, with secret proceedings where only the NSA gets to make a case. Not exactly a legitimate safeguard.
I also have reservations about the grandparent comment, but PRISM is still pretty awful.
Alternatively, you could say that billions of people live in countries with no restrictions on espionage of these companies, and with no recourse. Has NK faced justice for the Sony hack? Has the US faced justice for taps of overseas cables? No on both counts. If anything, having your country be a member of PRISM grants you as a citizen greater protection over how that data is used against you by that government.