They take the circuits out of people's brains that make it possible for them to think for themselves. Their world is like the one that George Orwell depicted in his novel. I'm sure you realize that there are plenty of people who are looking for exactly that kind of brain death. It makes life a lot easier. You don't have to think about difficult things, just shut up and do what your superiors tell you to do.

1Q84 (ed. Vintage, 2011) - ISBN: 9780307957023