"I do not believe that Snowball was a traitor at the beginning," [Boxer] said finally. "What he has done since is different. But I believe that at the Battle of the Cowshed he was a good comrade."

"Our Leader, Comrade Napoleon," announced Squealer, speaking very slowly and firmly, "has stated categorically—categorically, comrade—that Snowball was Jones's agent from the very beginning—yes, and from long before the Rebellion was ever thought of."

"Ah, that is different!" said Boxer. "If Comrade Napoleon says it, it must be right."

In at least 150 words, identify the theme that is illustrated in this excerpt from Animal Farm and explain how it is developed in the story.