The philosophers are the only ones who know the value and superiority of theoretical life. The rest will only appreciate their efforts once they are successful. This is an effort on the part of Plato to justify the use of force. Ordinary people will not strive autonomously or voluntarily towards a theoretical life because they do not understand the value of such a life. They will have to be forced (e.g. educated, moderated etc.). An emotional and materialist way of life must be prohibited. The leaders must not follow the desires of the people – as they do in a democracy – but on the contrary suppress these desires.
People have to be coerced. They must be taught the value of theoretical life. Their intellect must be stimulated, and their passions moderated. Censorship is therefore important. Art which stimulates the passions and desires must be prohibited. Art must be rational instead of emotional. Plato did not appreciate the art and mythology of his time, because they depicted the gods with the same shortcomings as man. Art must give the right example (Christianity and communism later followed in Plato’s footsteps).
However, Plato wanted to avoid physical force. He believes that truth is better than force and also better than persuasion based on opinions and argumentation. Self-evident truth forces the mind to accept it, but this force is quite different from physical force and it is more persuasive than opinions based on arguments.
The question is whether physical force can always be avoided. First, though, Plato wants to try the transmission of truth by way of education. He even proposed to take away the children from their families in order to insulate them from the bad habits of the ordinary people. A kind of tabula rasa. The purpose of education is to mold people according to the image or the model of the philosopher, to make a new man. If it is impossible to have a tabula rasa by means of forced adoption, then the old habits must first be taught away before new habits can be imprinted.
However, this is already a very violent form of education. Moreover, not everybody is adequate material for the fabrication of a philosopher. What happens with those people who turn out to be somewhat different from the plan? The best that can happen to them is hard discipline; the worst is elimination. They may be a bad example to the rest. Elimination either directly or through eugenics and arranged marriages.
The Platonic ideal is a society of people who lead a thinking life, who know the eternal truths and disregard the changing appearances, the desires of the body and the cycles of natural necessity. But it is not democratic to force one vision of the good life on all citizens. In a democracy, people must be free to choose their own good life. If we force them to lead a particular kind of life we enslave them, even if we think that it is for their own good and that later they will thank us for it.
And after we enslave them, we run into the problem of those people who are not able to live up to the model. Plato believes that the power of thinking can overcome the body and that this power can be developed and trained. Every human being has the power of thinking and the capacity to develop this power in such a way that it is correctly balanced with other powers such as emotions, ambitions etc.
But Plato admits that this training and discipline may sometimes be unsuccessful. The mind may not be able to gain a position of superiority with regard to other, more bodily faculties and desires. Some people will never be strong enough to fight the beast in them, not even with extreme discipline in a dictatorial state led by philosophers with an iron hand. The one who, in the eyes of Plato, was the best master of the beast in himself and hence the example to us all, was Socrates. By refusing to escape after having been condemned to death, he showed the undisciplined democrats how to live beyond desire, the ultimate desire being the wish to live.