You're making a category mistake. The word 'libertarian' in 'libertarian free will' in the context of theology has almost nothing to do with the political philosophy known (now) as 'libertarianism.' I'm aware of Credo Mag, and am reading a book even now by its Editor-in-Chief, Matthew Barrett. Terms in one discipline rarely translate to others. I thoroughly reject, in theological terms, 'libertarian free will.' But that's not what we're talking about.

1. Christians are pilgrims, not ground-conquerors in the geopolitical sense. At least, _not yet_. This is the historic amillennial position.

2. The (institutional) church is not to grasp after the sword. The weapons of our warfare are not carnal, but spiritual. We win the world by our _words_ (namely, the gospel).

3. Christians _as Christians_ are free to take up political office, but are not permitted to use it as an instrument of conversion or even extension of the church proper, but to uphold just and wholesome laws.

4. The libertarian political philosophy is little more than the '2nd table' of the 10 commandments: don't hurt people (6th), don't take their stuff (8th), and honor your contracts (7th and 9th). These are applied in the civil realm--on the 'horizontal' level, so to speak--between man and men. The explicitly religious commandments (they're all religious, but follow me for a moment), the so-called '1st table', which are 'vertical'--between man and God directly, are not (or, at least, should never) the jurisdiction of the State. At least not until the King returns. Then, we have theocracy again.

I am well aware that atrocities have happened, and will continue, until the Lord returns. That does not mean we interpret Scripture according to our own worldly wisdom. Christ rebuked his disciples for that kind of thinking. When he said, 'not yet'--he meant it. We would do well to believe (and obey) him.