We're all brainwashed.
Probably 99% of us are. Still, all it takes to free your mind is accepting that everything you believe in just might be false and spending a few years doing objective research without limiting yourself to mainstream sources.
You have a belief system such that you think there was no systematic murder of any group of people, for example, Jews or Poles, by the Nazis in WWII.
It is analogous to the belief system that Scientologists share in thinking this:
Past lives, "Secret" Levels and Extraterrestrial beings
See also: Operating Thetan and Space opera in Scientology doctrine
In Dianetics, Hubbard proposed that the cause of "aberrations" in a human mind was an accumulation of pain and unconscious memories of traumatic incidents, some of which predated the life of the human. He extended this view further in Scientology, declaring that "thetans" have existed for tens of trillions of years (several orders of magnitude greater than what mainstream science generally estimates the age of the universe to be). During that time, Hubbard says, they have been exposed to a vast number of traumatic incidents, and have made a great many decisions that influence their present state. Hubbard's 1958 book Have You Lived Before This Life contains descriptions of past lives given by individual Scientologists during auditing sessions. According to an early lecture of Hubbard's, it is, as a practical matter, both impossible and undesirable to recall each and every such event from such vast stretches of time.[87] As a result, Hubbard's three-decade development of Scientology focused on addressing only "key factors."
According to Hubbard, some past traumas may have been deliberately inflicted in the form of "implants" used by extraterrestrial dictatorships such as Helatrobus to brainwash and control the population. Hubbard's lectures and writings include a wide variety of accounts of complex extraterrestrial civilizations and alien interventions in earthly events, collectively described by Hubbard as "space opera." There is a huge Church of Spiritual Technology symbol carved into the ground at Scientology's Trementina Base that is visible from the air.[88] Washington Post reporter Richard Leiby wrote, "Former Scientologists familiar with Hubbard’s teachings on reincarnation say the symbol marks a 'return point' so loyal staff members know where they can find the founder’s works when they travel here in the future from other places in the universe."
They have accepted that everything they formerly believed in just might be false and they think that they have spent a few years doing objective research without limiting themselves to mainstream sources, although they call it being cleared through auditing sessions.
My point is that I think that their beliefs are incorrect, just as I think that your beliefs are.
Lets say that Scientologists came to Intensity and asserted these facts and when you disagreed with them and you thought that their beliefs were wacky, they asked you to objectively prove to their satisfaction that the extraterrestrial dictatorships such as that of Helatrobus never existed. How would you ever be able to prove it to their satisfaction, when they have spent a great deal of time and money becoming brainwashed that this is true?
