I can hardly think of any alternative other than "an eye for an eye". While I do lean toward anarcho-capitalism, I struggle to envision a society that relies solely on the non-aggression principle. When someone infringes on another person's freedom, there must be a mechanism in place to protect that individual if they cannot defend themselves. I recognize that the Department of Justice is often inefficient and corrupt, but I acknowledge that these are complex questions without clear answers, and there is no always perfect solution, if any.