Mens rea and actus reus only refer to mental states and actions. Different crimes require different mental states and actions, so they aren’t helpful for actually shaping criminal law. They’re just legal elements (and this only applies to criminal law).

Involvement is determined by proximate causation, which would depend on reason-based factors (intentions, foreseeability, geography, etc.) Again, it’s not intuitive and even the rights that seem straightforward tend to have exceptions. For instance, you won’t have the right to kick someone off of your property if they have taken that property through adverse possession (which also depends on reason-based factors). The standard which we can say an act is right or wrong is based on social contract principles. Simply declaring rights isn’t helpful for the specification, prioritization, or genealogy problems I discuss in the piece. Libertarianism fails to address these problems.