What sort of ''benefaction`` is it to have kept yourself from a nefarious crime? In such circumstances not to have been slain by you seemed to me justly not so much a matter for gratification as for bitter regret that it was in your power to do so with impunity.
Phillipic II, Marcus Tullius Cicero, pg 69 Loeb Edition
I have often heard, from people knowledgeable in the history of antiquity, the claim that Brutus and the other republicans which supported his tyrannicide were ungrateful to Caesar since they were spared from murder. That somehow Caesar by restraining himself from further crime created in the spared victims some obligation to him for having not taken life which was not his to take. Cicero compares this to a brigand who takes your possessions but leaves you with your life. Caesar marched on Rome and usurped, by the standards of the day, a free country and set himself up as dictator for life. These crimes are not dissolved by keeping himself from committing further ones. By these acts alone he rendered his own life forfeit and killing him by any means possible was just. An act of tyrannicide is the only thing due to a tyrant.