I think Orwell's point was even simpler: the overriding purpose of totalitarian political systems is power over individuals, "a boot stamping on a human face - forever". The actual ideology and stated goals are just window dressing towards this end.
"We know that no one ever seizes power with the intention of relinquishing it. Power is not a means; it is an end. One does not establish a dictatorship in order to safeguard a revolution; one makes the revolution in order to establish the dictatorship. The object of persecution is persecution. The object of torture is torture. The object of power is power."
Edit: Personally, it's this self-awareness of their own real motives that make the Inner Party of Ingsoc so scary.
