In discussing politics, I prefer to focus on outcomes over ethics. This sounds like I am taking a stand on the ageless means versus ends controversy but I'm not. Rather I consider the use of good means to be part of a good outcome. Means and ends are fungible; they can be traded off against each other.
To sum up my political values in one phrase: I don't like to treat people poorly and I don't like for awful things to happen. This captures the way that many people think about politics, maybe even most people.
However, libertarians tend to elevate means above ends to an extent that is unpalatable to the popular conscience. The standard way that libertarians wiggle out of this criticism is to deny that libertarian means ever lead to anything but the best possible outcomes. But that is when the movement takes on an air of a religious phenomenon - economic scientology. It assumes the existence of a benevolent world that is not guaranteed.
If you can't think of one instance where libertarian policy might create a sub-optimal outcome under some circumstances, then we're not going to have very interesting policy conversations. Anyways, I'd rather discuss structure instead of policy.
Libertarian ethics has a weird effect when it comes to the policy decisions which shape the substantive character of the world in which we live. Current governments possess an odorless, colorless quality called "publicness", and therefore libertarian ethics condemns these entities as illegitimate managers of the land they possess. Moreover, it strictly limits the policies they may ethically pursue. Governments may not create a public safety net which alleviates the worst suffering of citizens from sudden illness or injury - the taxes to pay for it would be coercive. Nor may governments seek to shape immigration policy in favor of well-educated and highly-skilled persons, or prevent pollution in situation where the cost of doing so through courts is infeasible (e.g. pigovian gas taxes), or offer incentives to have children to a population breeding below the replacement rate. A manager cursed with the quality of publicness must sit on its hands and hope that everything works out for the best.
But in some future world where all governments have passed through at least a momentary period of "privateness" (think seasteads or burbclaves) libertarian ethics allows managers to enact any set of policies they damn well please. If every government in the world were a fundamentalist theocratic mormon dictatorship that flogged gays and banned coffee, libertarian ethics would consider that perfectly fine as long as the management was put in place by some legitimate owner.
Libertarian ethics can lead to weird outcomes in some extreme circumstances, outcomes that most libertarians wouldn't like. I suggest we should allow outcomes to shape our decisions in concert with our ethics so we can live in a world that is pleasant to be in and not just a world that satisfies all the checkboxes of our moral philosophy.
This is the Libertarian Paradox again. It is also a good case for Moldbug's Formalism, which is less about ethical navel gazing and more about designing governments that have the incentive to function well.