Human beings act in a great variety of irrational ways, but all of them seem to be capable, if given a fair chance, of making a reasonable choice in the light of available evidence. Democratic institutions can be made to work only if all concerned do their best to impart knowledge and to encourage rationality. But today, in the world's most powerful democracy, the politicians and the propagandists prefer to make nonsense of democratic procedures by appealing almost exclusively to the ignorance and irrationality of the electors.