What Early Rome Can Teach Us About Power & How We Lie to Ourselves

I was reading over Livy's The Early History of Rome recently and the following passage jumped out at me. It always amazes me how those in power rationalize their right to stay in power, independent of whether it's just.
To set the context, Rome has just deposed its king and monarchy and has formed a fledgling republic. The disgraced royal family travels the land trying to drum up an army to attack Rome and regain power. Talking to another king outside Rome they counsel: