Step 1: Find someone using encryption
Step 2: ???? pretty easy to create a virus or something ????
Step 3: Access encrypted information.
Why dig a well when water evaporates into the air? Because pragmatically the amount of water over time matters and what could be described in an incredibly naive way as an absolute suddenly becomes a very different scenario when looking at reality.
The NSA has tapped fiber backbones, encryption would stop them from getting information from that source.
If you think there is already no privacy, post your full name, address and a picture of yourself in the shower, I'll leave it up to you whether you want to encrypt it or not.
(Also the fact that anyone is able to store crypto-currencies pokes an immediate hole in your theory)
I'm actually OK with the idea of sending my full name, address and a picture of myself in the shower to the NSA, CIA, SIS or similar, to be included in one of their databases. Because that's what we're talking about, privacy from law enforcement and intelligence agencies searching for criminals, spies, terrorists etc. To suggest that posting such information publicly is exactly the same as it existing in these agency databases is pretty disingenuous.