Objectivism is the philosophy developed by Ayn Rand and derived from Aristotle, which is based on the fact that reality exists as an objective absolute, that man’s mind–his reason–is is sole means of gaining knowledge of it, and that man needs a rational morality.
Rothbardianism is a legal theory that states because means are scarce, man can come into conflicts. The just owner of the scarce resource that has come into conflict is the non-aggressor while the conflict initiator is the aggressor.
The state, its components, & aggressive behaviors derive from the primacy of consciousness fallacy---that man's thoughts & whims have greater merit than rational non-contradictory philosophy.
Where Rand fails Rothbard begins.