This is really the core technological issue that has enabled much of the recent mass spying: the Internet really was not designed with security, privacy, or anonymity in mind.
Remember that it started as a research network that was used primarily among academics. Academia is generally a very open and trusting environment. The last thing the inventors of the Internet though of was trying to protect their computers, data, or privacy. We are living with the consequences of that mistake.
The second major cause of this mess is the computer illiteracy and historical ignorance of much of the world's population. They don't understand how they are making themselves vulnerable by sharing so much information about themselves and trusting corporations that provide "free" web services to them. This is slowly changing for the better, as people become more technologically savvy and stories like the current spying scandals and various security breaches hit the news.
As for the technological and security minded among us, particularly those who are just now starting to think about running their own mail servers, what took you all so long? None of the recent revelations should have been unexpected.
The Internet needs a major privacy, security, and anonymity overhaul. If it's not rebuilt with those concerns at the core, they will all remain mostly illusory to the overwhelming majority of Internet users.