Catholicism has its "just war" theory. Here is my stab at a "just revolution" theory:
"A government which fails on a systemic basis to respect individual rights and instead habitually rules by initiation of force is illegitimate, therefore any individual or group of individuals whose aim is to replace its rule with something significantly more libertarian have the right to subvert or overthrow it by any means generally consistent with such an aim.”
Do you think "significantly more respectful of individual rights" means anything different than "significantly more libertarian?"
As far as a "duty" to replace a government, I'm a bit more cautious, because of what that might imply. Would you say that a duty entails an obligation? If so, what is the relative force or weight of the obligation in this case? Would you say that people have an equal, lesser, or stronger "duty" to care for the less fortunate? To vote? To love their parents or children? To tell people when you have passed gas in a closed room? To go out of your way to return the money when you have accidentally received more change than due from a purchase? At what level does "duty" rise to an obligation that should be enforced by gentle teaching and persuasion? Enforced by ostracization or harsher social sanction? Enforced by law?
Fine....I figured that many if not most people aren't very familiar with
the meaning of the term "libertarian" it would be better to describe it
than use the word.