The worship of Popularity over Truth
The nature of democracy demands that popular fallacies become official truth — any politician who opposes this is voted out of office — so that government decisions are based upon fantasy not fact, which is madness.
The insanity bestowed by democracy is not an accident but implicit in its nature, which is a communal understanding lacking both moral restraint,
(for there is no church law allowed to hinder the demands of the people)
and personal responsibility
(for there is nobody to blame, there is no one charged with caring about truth, there are only agents of the peoples' will, who care only about keeping their jobs)
so it cannot recognise right from wrong nor fact from fancy , which is rule by feelings and is insanity.
The private rewards given to the chosen agents of the people's will can only be won by humouring the electorate. As it is unable to uphold truth, over time a democratic government must become increasingly deluded, so increasingly unable to uphold justice, maintain order, or attain any sensible end. ( Also see Edward Gibbon's, and Plato's opinion).