Looking at someone from the outside, it's easy to tell when they've been brainwashed by a high-control ideology, authority figure or news source.
However, how is it that I myself can find out if I have been brainwashed? If indeed I am brainwashed, then surely my own faculties alone are incapable of detecting and rectifying it. By the very nature of brainwashing, we must rely on those who disagree with us to challenge our beliefs, yes? Everyone who challenges Q, PizzaGate, the theory of the Cabal, etc. gets banned from these forums. Doesn't it then follow that if indeed I am brainwashed, I would never be able to realize it because I cannot hear any dissenting voices?
This is assuming that it's possible to be brainwashed both on the left and on the right, which of course we know is the case.
A suppose this is more a question of philosophy. So truly, how would I know if I was brainwashed?