It is my conviction that by expressing the problem of politics in the form ‘Who should rule?’ or ‘Whose will should be supreme?’, etc., Plato created a lasting confusion in political philosophy.
First of all, such a reply is liable to persuade us that some fundamental problem of political theory has been solved. But if we approach political theory from a different angle, then we find that far from solving any fundamental problems, we have merely skipped over them, by assuming that the question ‘Who should rule?’ is fundamental. For even those who share this assumption of Plato’s admit that political rulers are not always sufficiently ‘good’ or ‘wise’ (we need not worry about the precise meaning of these terms), and that it is not at all easy to get a government on whose goodness and wisdom one can implicitly rely. If that is granted, then we must ask whether political thought should not face from the beginning the possibility of bad government; whether we should not prepare for the worst leaders, and hope for the best. But this leads to a new approach to the problem of politics, for it forces us to replace the question: Who should rule? by the new question: How can we so organize political institutions that bad or incompetent rulers can be prevented from doing too much damage?
By ‘fallibilism’ I mean here the view, or the acceptance of the fact, that we may err, and that the quest for certainty (or even the quest for high probability) is a mistaken quest. But this does not imply that the quest for truth is mistaken. On the contrary, the idea of error implies that of truth as the standard of which we may fall short. It implies that, though we may seek for truth, and though we may even find truth (as I believe we do in very many cases), we can never be quite certain that we have found it. There is always a possibility of error; though in the case of some logical and mathematical proofs, this possibility may be considered slight.