In Animal Farm, What argument does Squealer use to keep the animlas from protesting Napoleon's takeover? In what way is this argument valuable as a propaganda?

Squealer tells the animals that the pigs are the only animals separating them from human control and that Napoleon is the brainchild. Squealer says that pigs must have the best food like apples to keep up the fight for independence. Slogans are shouted out like, "four legs good two legs bad" to re-enforce their collective spirit. This, of course, is propaganda designed to instil fear and misguided patriotism.