I have experienced the Klemmer seminars, and I would say that most people approach the seminars without any ability to think critically, and that this was not something done to them in a seminar. Klemmer did not take their ability to think critically away, they never had it to begin with. This is true of the majority of the US, and is true of all of us in some form.
Point well-taken. What lgats do is take advantage of and enhance the critical-thinking weakness. How can that be considered "personal growth"? Personal growth is just the sales pitch, and there's even an appearance that it's what the attendees get, but in fact they get just the opposite. Whatever critical thinking they went in with is significantly reduced, if not totally obliterated, when they walk out.