The detail that most strongly supports the theme that dictators care only about themselves and not those they rule is: “Napoleon ended his speech with a reminder of Boxer's two favourite maxims, ‘I will work harder’ and ‘Comrade Napoleon is always right’—maxims, he said, which every animal would do well to adopt as his own.”
This line highlights how Napoleon co-opts Boxer's dedication and loyalty for his own benefit, reinforcing his authority while simultaneously exploiting Boxer's laborious work ethic. By promoting these maxims, Napoleon shifts the focus to emphasizing his own unwavering rightness and the expectation that the other animals continue to work hard without questioning. This showcases his self-serving nature and disregard for the true contributions and values of the individual animals, which reinforces the theme of dictators caring primarily for themselves.