You're conflating rights with freedoms, which is the same category error as confusing legality with morality.

Your rights are, by their nature inalienable. They are recognized (or not) by individual power structures, granting you freedoms.

Under an authoritarian regime, your freedoms maybe be limited, for example, your right to free speech may be curtailed by men with guns. Killing those men is illegal, but not unethical, exactly because they are infringing your rights.

This all may seem academic to the person with a boot on their throat, but it dictates how outsiders view one's actions.