I hate to hijack this thread but quite often it has NOTHING to do with cult "programming". Many people can have selective memory. It has more to do with the individual's overwhelming need to be "right" and fighting against anything that doesn't match their need.
Off the top of my head I can think of one other prime example : a cheating spouse. They frequently fail to remember events, statements, and witnesses to their activities even when confronted with witnesses and evidence.
If you want to see many many examples of this behavior, check out a website forum for people who frequently see this behavior.
www.divorcebusting.com/forums/ubbthreads.php Go to the Midlife Crisis
threads. People are frequently described as "not being themselves" or even "taken over by an alien".
Also, one respected Christian Pastor James Conway has written many books about this behavior as it applies to a person's midlife. See his website at
www.midlife.com He describes how a person "wakes up" one day and cannot remember things that they were doing.
Human behavior is far too complex to attribute all similar behaviors to one source such as cults, or booze, or anything else. Try it and you'll find that there are too many exceptions to explain.