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)
You need encryption for the same reason you need locks. Locks are not the only trick to provide you security but they are pretty much a very necessary tool. Without solid encryption you can't have a lot of the good things on the internet: online banking, online shopping, filling taxes online,...
> it is still pretty easy to create a virus or something that access the data at the moment it is used
It is not so much anymore. Viruses are getting quite harder to make, even for Microsoft Windows. And, even if you were right, you still need encryption for people that are smart enough to avoid viruses.
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.