sometimes I also believe the internet was designed that way, to be "insecure", it's a military invention after all.
but then again I guess we can't take such things for granted. Communication technologies for the masses before were never anonymous at all. You always had to register your phone in one way or another, and communication was unencrypted of course, and you had to take the authorities' word that they follow the law and don't monitor everything without a reason and strong suspicion.
Same with former data services like
BTX, it was just self-evident that all communication data would be available for authorities on request. But in this new internet-www-thing it was at least new and (at least here in Germany) very unusual and anarchic that the providers of content (website owners etc) or e-mail would not really and necessarily know who you are.