People often express to me that they wonder how it is I was in a high control group when I can see clearly how wrong it is. Not only that but I often am asked how to wake up friends and family who are in such groups.
In order to answer this you first need to understand how cognitive dissonance works. The following video is one of the best I have seen in explaining how it works.
Once you understand what you are up against then it is easier to find a way to plant seeds or promote critical thinking.
It is also important to know that we can all be manipulated, I hope you enjoy the video.