Regarding my answer to an argument of practicality vs morality, I think I have already given an answer in one of my previous posts. In my opinion, we shouldn't apply ethics framework to governments or states, that is, we shouldn't measure them by moral standards, but rather stick to effectiveness or expedience criteria...
Okay, what metric shall we use for effectiveness? I would say we should use freedom/liberty as our metric. That again gives us anarchy, succeeding at 100%.
Actually, there are many objective metrics to measure the efficiency of the state existing nowadays for this very purpose. Economic growth as one of the most evident and encompassing example of such a metric. Also, how are you going to define freedom/liberty in more or less objective terms and would it be a moral issue then?