Well it all started with the Pigs persuading all the other animals that they were all equal. Once they had sold that idea the pigs decided that although all animals were equal they (the pigs) were really more equal than any other animal and so it went on.
Pretty much the same as our Members of Parliament ........ "We are all in this together but because we can we are going to look after ourselves first and the rest of you will just have to manage as best you can on the crumbs we allow you."