 Some natural duty theorists point to the intensity and frequency of interaction among those who live in close proximity to one another as a justification for the duty to obey the laws of the particular jurisdiction in which one resides (Waldron 1993; 1996). Others emphasize that a person who free-rides on his fellow citizens’ support for and compliance with the law to act on his own judgment of how he can best discharge his natural duty of justice unfairly takes advantage of them. Absent their good-faith sacrifice of the liberty to act on their private judgments regarding what justice requires, the free-rider would likely be unable to act as he does (Wellman 2005, pp. 44–5). Finally, some natural duty theorists argue that Simmons misconstrues the natural duty of justice. Justice is not an outcome or state of affairs that agents have a duty to promote via whatever means they judge to be most effective or efficient, be it the political institutions of their state or those of another. Rather, justice characterizes a particular manner of interacting with others, such as with respect for their freedom-as-independence or their fundamental interests, including but not limited to their interests in judgment. At least for a citizen of a liberal democratic state, the latter construal of justice entails that she can only treat her fellow citizens justly if she guides her conduct according to its law (Stilz 2012).