The ‘non-aggression principle’, in my experience of libertarianism at least, is not as central / common across libertarian writings.

Wikipedia:

> Libertarianism (from French: libertaire, "libertarian"; from Latin: libertas, "freedom") is a political philosophy and movement that upholds liberty as a core principle.[1] Libertarians seek to maximize autonomy and political freedom, emphasizing free association, freedom of choice, individualism and voluntary association.[2] Libertarianism shares a skepticism of authority and state power, but libertarians diverge on the scope of their opposition to existing economic and political systems. Various schools of libertarian thought offer a range of views regarding the legitimate functions of state and private power, often calling for the restriction or dissolution of coercive social institutions. Different categorizations have been used to distinguish various forms of libertarianism.[3][4] This is done to distinguish libertarian views on the nature of property and capital, usually along left–right or socialist–capitalist lines.[5]