This reminds me a little bit about the argument about torrenting and privacy. We all say "peer-to-peer networking" is for sharing personal files among one another but e all know it's for pirating movies and games and software. I can't think of any reason why you would want to "mix" bitcoin. It is anonymous enough. How very paranoid do you need to be to use mixers? I ask the question why are you so paranoid to begin with? What are you doing that makes you paranoid.