Men born to freedom are naturally alert to repel invasion of their liberty by evil-minded rulers.
In fact, the mechanisms by which people change their beliefs are extraordinarily subtle. At first, you may suppose that beliefs are changed by rational argument. We practice that process in school in debate, literature, and philosophy classes. Sometimes, by the eloquence and forcefulness of personality, a speaker can so stir a crowd that they are compelled to act. Sometimes, a story, like A Christmas Carol can touch a heart so deeply that one is forever changed.