The important difference which separates human beings from other living things is that the latter do not possess the ability to think. Thinking is a psychological process. Within that process thoughts are produced in human beings. Everyday activities, as for example shopping are a simple product of thoughts based on categories such as morals, existential problems and conditions. Thoughts develop from the most simple to the most complex.
Thoughts concerning state philosophy, political and social subjects are very complex.
But human beings did not always possess the freedom to express their opinion freely. To be precise as regards criticism of political and social subjects, in so far as it affects the ruling classes, those in power have never been tolerant of political criticism. Humanity has always been engaged in merciless battles for the freedom of expression. In the middle ages the church was the institution which suppressed the free opinion of people. It was the church which determined in detail what the truth was and which opinion people should express.