Democracy actually originated from God's Will and started at the Babel Tower, when the united humanity was confused and dispersed by God, people has never been successfully reunited in 'one mind' and 'same thought', either by language or cultural barrier.
The second reason of democracy is the imperfect nature of human being, which was inherited from One Sinned Man. The imperfectness of individual causes the corruption of an organisation, and at last the flaw of the whole human society.
We hate evil but not the evil person, just as the doctor cures sickness, but doesn't destroy the patient. We can find evidence everywhere in the Bible that God tried to get rid of evil simply by destroying sinners, for example he only chose 8 people and used the Great Flood to clean up the whole earth. Could that be called great love and benevolent?