There is no necessity for the man who means to be an orator to understand what is really just but only what would appear so to the majority of those who will give judgment; and not what is really good or beautiful but whatever will appear so; because persuasion comes from that and not from the truth.
PlatoThe people always have some champion whom they set over them and nurse into greatness. ... This and no other is the root from which a tyrant springs; when he first appears he is a protector.
Plato