John Zmirak examines the issue with the writing of Pius IX. Excerpt:
It seems clear that the public sphere in America is irretrievably secular. So the only logical response of Christians must be to try to shrink it. Instead of attempting to baptize a Leviathan which turned on us long ago, we’d do much better to cage and starve the beast. We should favor low taxes—period, regardless of the “good” use to which politicians promise to put it. We should oppose nearly every government program intended to achieve any aim whatsoever. We can make exceptions here and there: We can favor the protection of innocent lives, which would cover things like fixing traffic lights and throwing abortionists into prison. But that is pretty much that. Christian public policy should focus not on capturing the power of the State but shrinking it, to the bare minimum required to enforce individual rights, narrowly defined.