Have you only read Churchill's quote on the matter, or have you actually looked at various forms of governments throughout the ages? (Not just the post-WW1 ones.) If democracy is so good for a State, why aren't corporations and military institutions modeled after it? I second the recommendation in this thread for "Democracy: The God that Failed". It has its problems and the author does not fully explore monarchism and related systems, only showing that monarchy is superior to democracy, and then he falls back to the comfort of his anarcho-capitalist views and rejection of the need of a State, but it's still an excellent read.