The government took over Freedom Hosting, and allowed Child porn and worse to continue for months, hoping that they could also maybe get the terrorists to log in, then slipped in some code in a maintenance page to completely de-anonymize users.
I remember folks telling people to get into TOR to fight NSA spying. Yeah, THAT worked real well, didn't it?
And Encryption isn't as hard to crack as advocates were saying either, especially with government-mandated back doors.
The next time someone says you should trust all your dirty laundry to some new technology, perhaps you shouldn't listen.