Because government is conceived by the people, it must uphold the interests of the people, lest its purpose be defeated. Responsible government is a principle that attempts to achieve this by giving the people a direct say, or at least allow them to elect representatives. Under this framework, the government becomes directly responsible or accountable to the citizens it governs.
This widely accepted (by many democratic countries) principle can readily be applied to guild leadership in World of Warcraft. The guild's officers simply need to act in the best interests of the membership.
