Squealer is an essential element in Animal Farm and Napolean's quest for power. As a master manipulator and persuader he is able to
turn black into white.
Squealer can explain everything and cover his tracks at the same time. He is the perfect representation of propaganda. He plays on the fears, pride and emotions of the less -than -intelligent animals through biased distribution of information; blaming Snowball for events that he clearly has no part in and convincing the animals that Snowball never did receive
the order of "Animal Hero, First Class."
He changes the rules - the Commandments to suit the continued 'rise' of the pigs and convinces the animals that opposition to the pigs would be opposition to the foundations of Animalism.
Revision of the rules convinces the animals of the fact that
“All animals are equal, but some animals are more equal than others.”
The sheets on beds, the milk , the alcohol are all examples of the brainwashing
as each successive commandment must be rewritten to allow for “exceptions”
The animals are aware of the harsh realities of their new life
that they were often hungry and often cold, and that they were usually working when they were not asleep. But doubtless it had been worse in the old days.
They are so afraid of a system that they actually can't really even remember but nothing can change the fact that
in those days they had been slaves and now they were free, and that made all the difference, as Squealer did not fail to point out
Even when Boxer is taken away, Squealer is able to 'explain' why the so-called ambulance has a sign for a horse slaughterer on its side.
'The end justifies the means' would be a good motto for Squealer. His position as Napolean's right-hand and his abilities to manipulate for his own benefit make him the perfect pig for keeping the peace and establishing the 'lifestyle' he intends to become accustomed to...pig or no pig!