Libertarians are not anarchists, Nazis, or Commies.
Libertarians are fine with courts and laws against murder.
Libertarians do not like TSA groping, NSA surveillance, or CIA torture.
The problem with "laws against murder" means that there are laws justifying murder... Laws are always subject to rule and interpretation. In my own state you do not have a legal right to stand your ground or defend your property. I think this is where the much maligned N.A.P (non agression principle) serves as a good guidline for governance. The problem then arises that rulers want to rule and not govern .