Illuminati and other agents are slowly lured in for years before being told about Luciferiniasm and how the Freemasons, etc.. seek to enslave society.
But the biggest secret only the higher ups usually know is that top members of the deep state are possessed by 1 or more demons. Usually the demon slowly takes over the body. This is why they are able to commit such evil.
After death,e demon torments them for a lifetime in hell and uses them as a slave. This is why the deep state are afraid to die.
There is one way to bypass hell and that is to strongly believe that hell is not real. The same can be done to escape the human experience.
For example if someone truly understand that they are NOT the human body, they will simply escape it but this requires rock solid sustained belief.
Eh, most people are at the least being influenced by demons. Some get possessed by bad choices, or trained weakness (childhood trauma and all), but some people don't like being alone in their own heads. The degeneracy of our elites very much hints at childhood trauma, so no big stretch. Is this really a big secret, except to hard-line atheists?
That said, I don't believe for one second that demons are why they can commit evil acts. Maybe for regular folk, that seem to have mental breaks, but not movers and shakers doing well-planned stuff. Humanity is capable of great evil, with no extradimensional help at all. Being aligned with other evils does not absolve them, IMO. More likely, IMO, the demons are able to aid them in gaining more worldly power. At low levels, there are stories voices have helped people get drugs, money, sex, and more. If you're stable enough to not let the secret out, and smart enough to look to the future, then they can help get you good stocks, foreign connections, and property deals, instead. You just have to give in to what you see as minor demands. They clearly are bound to space and time, but now how we are, and have knowledge of at least some short-term future events.
The death hypothesis, maybe. How our elites are obsessed with youth and immortality is weird, given that most of us just aren't, and most of them have children. It would also match up with voices (demons not getting to to the point of possession, not oppression, but mental influence) not caring if someone they're messing with dies, even though they seem to feed on their living, "energies."