Plough published this excerpt from The Cost of Discipleship by Dietrich Bonhoeffer. I'm sharing it rather late. (The article was published last year in August.) However, I think it's a helpful piece of the puzzle in making sense of the relationship between Christianity and politics.
If we took the precept of nonresistance as an ethical blueprint for general application, we should indeed be indulging in idealistic dreams: we should be dreaming of a utopia with laws which the world would never obey. To make nonresistance a principle for secular life is to deny God by undermining his gracious ordinance for the preservation of the world.