Much like banning porn, this tech is not the goal, but the means. Once they can ban porn the next logical course of action is banning the people we don't like. The tech is exactly the same; banning porn or gay media or conservative talk is the same thing from a technology point of view.
A thoughtcrime is the act of thinking of committing a crime.
Once you get stuff like this working, the next logical step is to act before the thought becomes physical. You don't want to be soft on crime now, do you Mr. Elected Official?