ok, i have this question and another part to it which is : How does Squealer justify it?
is it the part where he tells the animals about the pigs having to have the apples for themselves?
Squealer justifies the pigs behavior throughout the book, offering reasons that don't make logical sense but which bear the semblance of truth, the appearance of reason.
It's important to note that part of Squealer's persuasion comes from the way he shakes his tail. This has nothing to do with anything he says and only emphasizes that fact that Squealer is not telling the truth but is, instead, performing.
All those things are true; however, one other component is the fact that the other animals on the farm rarely question the authority the pigs have assumed. That's probably because they're used to having someone in authority over them (Mr. Jones) and it doesn't seem so very odd at first.
In a word, propaganda. They make themselves look good and change the laws to revere themselves while putting others in their places...well beneath the status of the pigs. They are the intelligent ones, and they take advantage of the very ones they pledged to take care for in the original meeting outlining their plans for rebellion.
In general, they conceal their breach of various laws by changing the laws. That is why the commandments keep changing. We see this, for example, when Squealer falls down while changing the commandment about alcohol.
As always, Squealer uses misinformation to back his statements. He claims that although most of the pigs dislike milk and apples--including himself--it is proven that they are brain food, necessary ingredients for the brainy pigs. It is best for the farm that the pigs eat the apples, not the other animals.