Freedom of thought?

I'm reading Slavoj Zizek's Welcome to the Desert of the Real. I found this passage to be interesting:

A hundred years ago, in his emphasis on the acceptance of some fixed dogma as the condition of (demanding) actual freedom, Gilbert Keith Chesterton perspicuously detected the antidemocratic potential of the very principle of freedom of thought:

‘We may say broadly that free thought is the best of all safeguards against freedom. Managed in a modern style, the emancipation of the slave’s mind is the best way of preventing the emancipation of the slave. Teach him to worry about whether he wants to be free, and he will not free himself.

Is it not emphatically true of our ‘postmodern’ time, with the freedom to deconstruct, doubt, distantiate oneself? We should not forget that Chesterton makes exactly the same claim as Kant in his ‘What is Enlightenment?’: ‘Think as much as you like, and as freely as you like, just obey!’ The only difference is that Chesterton is more specific, and spells out the implicit paradox beneath the Kantian reasoning: not only does freedom of thought not undermine actual social servitude, it positively sustains it.