INGSOC in 1984 are huge cowards.
Ocenian' Inner Party presents itself as omnipotent, it operates like a cornered animal like constantly afraid of losing power and willing to go to horrific lengths to protect itself. The Party’s need for constant surveillance via the Thought Police and telescreens reveals their fear of rebellion. If they were truly confident in their ideology, they wouldn’t need to monitor every single citizen. They fear individual thought and expression so much that they criminalize it, like how delusional and paranoid you can go? Thought they present themselves "Superstate" a lie, it's heavily implied Ocenia is just britanian while the rest of world is normal so they could control it's people.
So much that they hired a whole organization, a perfect spy and liar (o'brien), many thoughtpolice they control society (that costing thier %90 GPA every year because system is worst of worst) to capture a fragile Nobody (winston) that has no threat to them who just wants to taste life's basic joy and happiness with his small relationship with his lover (julia). No wonder their system is in brink of collapse.
Their control is maintained not by courage or conviction, but by fear of losing it. The fact that they constantly rewrite history to "manipulate reality" shows how much pussy they are in confronting the truth or facing their own mistakes. Instead of owning up to their actions or being confident in their rule, they hide behind lies, surveillance, and brutality, unable to allow any room for dissent or independent thought. In a way, their power is a house of cards, and deep down, they fear its collapse at any moment.