Well there's always Plato's argument for a "noble lie" that keeps the community together. Sometimes the (innately superior) rulers have to lie to keep the (innately inferior) hoi poloi to follow social convention and mores that go against their selfish instincts. Aristotle has a surprisingly similar line when he talks about natural "slaves" and natural "rulers", the latter of which rule the former in the interest of attaining the greatest good for all. This ideology actually justified much of modern slavery, when for example many new world slave owners justified slavery by commenting on how their "Christianization" of Africans ultimately was good for the Africans themselves - and of course this same ideology carried over into imperialist rule.
I think as far as logical arguments go, there is always the "justified authority" argument. For example, a parent pulling a 4 year old that runs into busy traffic forcibly by the arm back to the sidewalk is supposedly an example of "justified authority" even though it is in some sense a "tyrannical act". Whether you will have sufficient space to explore this problem is another question, but I think tyranny and the like have always been based on an attempt to justify their authority. The radical solution has always been to assert that no authority is really justifiable among equals - but that it is only because there is an assumption about the inherent inequality of peoples (a contradiction with most liberal values) that authority somehow manages to justify itself.
百花齐放
-----------------------------
la luz
de un Rojo Amanecer
anuncia ya
la vida que vendrá.
-Quilapayun