It's the same as writing a letter. Letters were always the formal expression of our thoughts, and because, when I was growing up, they repeatedly appeared in newspapers, books, court evidence and history I saw them as matters of public record.
You put your innermost feelings (or controversial opinions) down on paper and handed it over to someone else. You have just given it to the world.
Email speeded up the process. To me "send" has always meant "publish".
That's not to say there aren't many hundreds of emails I've sent that I would rather were only read by the initial recipient, but always at the back of my mind has been the knowledge that what I have written takes seconds to forward, or even upload.
It's the same with phone calls. Phone tapping has been around longer than I've been alive. Why do you think your conversation is secure? If it's that interesting, it might not be.
The real debate should be how we, as a society, deal with it, not whether it should be happening. The genie is out of the bottle. We are entering an age where privacy, as we know it, is dead. The rise of CCTV and social media takes this way beyond electronic communications.
You should assume that everything you are doing outside your own house is being watched and stored, as are the people you call up, and the websites you browse. You'd be stupid not to.