Propaganda as an appeal to emotion is practiced widely by the pigs. Squealer, the public-relations pig, often uses faulty logic to convince the other animals that the pigs need to have better comfort to keep the humans from returning:
"Do you know what would happen if we pigs failed in our duty? Jones would come back! Yes, Jones would come back! Surely, comrades," cried Squealer almost pleadingly, skipping from side to side and whisking his tail, "surely there is no one among you who wants to see Jones come back?"
(Orwell, Animal Farm, msxnet.org)
Because the farm is supposed to be operated equally by all animals, with all animals responsible for the well-being of all the others, this argument makes little sense; if the pigs "failed in their duties," the other animals should be able to step up and provide the same duties. However, the bogyman of Jones is enough to convince the other animals that the pigs absolutely need to have better food and accommodations, as well as not performing the same labor. After all, no animal wants to be blamed for aiding the return of Jones; in this fashion, the pigs improve their own station at the expense of the other animals.