@kolev @ashdod the libertarian position (both right and left) comes from an entirely different way of approaching the problem. But the fundamental point of the position is that the state isn't a legitimate arbiter of justice.
Trusting people who hold the power to kill with relative impunity (presidents, police, or people acting on their behalf) could also be said to be naive.
On the other hand, people do tend to regular themselves in most situations - it's generally only when we are pit against each other and need to act selfish in order to survive the conditions of capitalism that we tend to act in non-cooperstive ways.