I’m just saying that plenty of people say things in their jobs as public figures and don’t believe them (or say they don’t believe them or act in ways privately that indicate they don’t believe them).
As for the victims (I’m assuming you mean of the regime) not believing, there are plenty of people who are perfectly aware of the falseness of propaganda. Sometimes you act as if something is true, because it’s more comfortable, easier, and it just becomes how you live your life. There is a fair amount of literature on the Eastern bloc and how people lived within and accommodated state propaganda. For example, this excellent book:
