I would say that the oposite is true. Brainwashing takes the same mecha isms that we use as humans to be able to learn our how to behave in the society, and how to learn to be a person. I have small kids and they are like empty disks looking for something to copy. They copy behaviours that sourround them and make them part of their personality.

Adults just slow down the writting but we always try to fit in the social group that we are living. And that includes political opinions, faith, etc...