Ah, you mean
Unity and self-sacrifice, of themselves, even when fostered by the most noble means, produce a facility for hating. Even when men league themselves mightily together to promote tolerance and peace on earth, they are likely to be violently intolerant toward those not of a like mind.
The most effective way to silence our guilty conscience is to convince ourselves and others that those we have sinned against are indeed depraved creatures, deserving every punishment, even extermination.
Though they seem at opposite poles, fanatics of all kinds are actually crowded together at one end. It is the fanatic and the moderate who are poles apart and never meet. The fanatics of various hues eye each other with suspicion and are ready to fly at each other's throat. But they are neighbors and almost of one family. They hate each other with the hatred of brothers.
The fanatic cannot be weaned away from his cause by an appeal to his reason and his moral sense. He fears compromise and cannot be persuaded to qualify the certitude and righteousness of his holy cause. But he finds no difficulty in swinging suddenly and wildly from one holy cause to another. He cannot be convinced but only converted. His passionate attachment is more vital than the quality of the cause to which he is attached.
\ufffd Eric Hoffer, The True Believer
