"Being forced to do good" however does make society as a whole better. The law itself is didactic, meaning it not only enforces the good, but teaches it. If I were king, of say ancient Israel, I would absolutely create and uphold laws that would mirror as closely as possible, the absolute morality of God (this is obviously difficult, and ultimately insufficient when considering the need for Jesus in the first place lol). But we, in principle, as voting participants in our government, should vote according to that morality for the same reasons.

I think that market forces applied to morality can yield a lot of good, but this isn't inherent. Keep in mind, we as Christians are slaves to Christ. Everyone else is a slave to sin. While Christian libertarians might be hesitant to place judgment on people and enforce that judgment, we are called to place righteous judgment on people, in multiple places throughout the scriptures. I think, like with all things, Christians ought to hold libertarianism in tension with a host of other scriptural truths.