From Tor's front page:

What is Tor?

Tor is free software and an open network that helps you defend against traffic analysis, a form of network surveillance that threatens personal freedom and privacy, confidential business activities and relationships, and state security.

So, if the users of a service whose explicit mission statement is to provide anonymity and privacy apparently do not have "reasonable expectation of privacy," who does? Are they going to argue next that the private owner of a wifi-capable laptop has no expectation of privacy in their own home because the webcam could be conceivably hacked and remotely activated?