@ fnord
Interesting point. Though if you draw parallels with existing communication methods, if you wanted to seriously maintain your privacy, like with your argument under the oppression of a state and/or you knew something about a politician, if you were to phone someone about it, you'd use a call box. The email equivalent is a cybercafe, or get a laptop, WiFi card and piggy-back an unsecured WiFi network :-)
I'm all for personal privacy, though I think the effect on public privacy is very minor in this case.