I’ve had this thought in scattered glimpses over the years, never as cogently as Carson puts it here.
From Christ and Culture Revisited by D.A. Carson, p. 127
“Christians cannot possibly view democracy as “the cure” for the world’s ills. For many pragmatic and moral reasons, we may concur that, granted attendant structures and liberties, it is the form of government least unaccountable to the people and least likely to brutalize its citizens without some eventual accounting. It is a form of government most likely to foster personal freedoms, including, usually, freedoms for Christians to practice and propagate their faith. But it has also proved proficient at throwing off a sense of obligation to God the Creator, let alone the God and Father of our Lord Jesus Christ, which is another way of saying that it is proficient at fostering idolatry.