Look, I fully expect that when Jesus comes again we will have libertarianism. But until then, we are going to have to have some sort of government human nature being what it is. And that means that people will have to take responsibility for shaping our society.
The whole "don't vote, it only encourages them" attitude of the doctrinaire libertarian or the notion that they have no responsibility for the society that we have does not help in the work that absolutely MUST be done if we are not to descend into tyranny.
Remember, the tyrants are out there and if you sit on your hands and do nothing -- as too many libertarians are wont to do -- you have failed in your duty to help bring freedom.