What aspects of hounyhnhnm society are present ted as truly utopian and worth emulating in gullivers, part part 4?
Gulliver has come to love the Houyhnhnms, their society, and their way of living. He writes, "I had not been a Year in this Country, before I contracted such a Love and Veneration for the Inhabitants, that I entered on a firm resolution never to return to human Kind, but to pass the rest of my Life among these admirable Houyhnhnms in the Contemplation and practice of every Virtue."
Through the Yahoos, Gulliver has come to see some awful aspects of human nature, and Swift has shown his readers what they would be (and often are) without the intelligence and graces of which they are capable. Gulliver seems willing to turn his back on the English people in favor of those he deems better than the English. Now that he has been exposed to many alternatives, he can think carefully about who to admire and what political systems to favor, and the English certainly come up short in relation to the Houyhnhnms.
