According to your quiz, I have nothing to hide, but I'm still a strong privacy advocate. Privacy to me is all about context and understanding the consequences of your actions. If I run naked through Times Square, I shouldn't have any reasonable expectation of physical privacy, but if I whisper to a friend I would. Either way the important factor in both scenarios is that your expectation of privacy aligns with reality.

As for context, specifically with regards to prism, if I dial a wrong number that happens to belong to a terrorist, I may find myself guilty by association, with the burden of proof of innocence in my own hands. Quickly hanging up and dialing a similar number after might not be sufficient defense since that could be a strategy terrorists use to cover their tracks.