People who have no hold over their process of thinking are likely to be ruined by liberty of thought. If thought is immature, liberty of thought becomes a method of converting men into animals.
There are, of course, all sorts of other unpleasant regimes outside the walls as well - the military dictators of Latin America and the apartheid regime of South Africa.
The police feel that most of the public are against them and that there is a lot of bad feeling.