“I am a [proponent of democracy] because I believe in the Fall of Man. I think most people are democrats for the opposite reason. A great deal of democratic enthusiasm descends from the ideas of people like Rousseau, who believed in democracy because they thought mankind so wise and good that every one deserved a share in the government. The danger of defending democracy on those grounds is that they’re not true… I find that they’re not true without looking further than myself. I don’t deserve a share in governing a hen-roost. Much less a nation. . . . The real reason for democracy is just the reverse. Mankind is so fallen that no man can be trusted with unchecked power over his fellows. Aristotle said that some people were only fit to be slaves. I do not contradict him. But I reject slavery because I see no men fit to be masters.” — C.S. Lewis, Present Concerns
Democracy can only be supported by Pelagianism or Total Depravity. If every man, no matter how bad, has a spark of good within, he should not be prevented from letting that light shine on election day. But if every man, no matter how good, has some sin within, he cannot be trusted to be the light of a nation, let alone the entire world.
Slavery is not inherently sinful, but men are. If slavery were mala in se, the New Testament would not have commands to masters on how to handle themselves as Christians. It would simply rebuke them for having slaves and command them to liberate them. Yet, in Christianity the seeds of liberation are planted so that even in a slave-holding society, when saved and sanctified according to God's Word, the natural result is less slavery, not more as men are raised and nurtured in the discipline and instruction of the Lord, freedom prevails. As such, it makes sense that the more the world is conformed to the image of Christ, the more it will accept the Christian doctrine of total depravity. And the more it does that, the less it will accept the leadership of any man who takes exception to that reality, especially when it is himself that is concerned.
The Fall of man must moderate the power of any man, both in kind and in scope.
Democracy is only justified where demos confesses itself depraved.
Democracy without this doctrine is merely despotism in denial.