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Throughout his journeys Gulliver comes into contact with several different races of people, all of which are narrow-minded in some way. Many of the peoples are conspicuously narrow-minded, such as the Lilliputians, who have wars over the correct way to cut open an egg. (Such squabbles over unimportant matters are a common object of satire.) Even the Houyhnhnms, who are so revered by Gulliver, cannot believe there are other reasonable ways of living.
Much of Swift's satirical focus is on people who cannot see past their own ways, their own power, or their own beliefs. Readers (especially his contemporary readers) can see themselves in some of this satire.