D4G, I totally agree that the majority of manipulators don't read some book on How to Manipulate and Control Others, but that doesn't mean that some people do not.
The WTBTS has published many articles on the subject proving that they have at some time given conscious thought to the subject. (See for example the series of articles on the subject of Propaganda in the June 2000 Awake! magazine).
Again, CD theory explains why many people continue to hold on to beliefs that are demonstrably wrong.
There are a large number of manipulative techniques which do not require disconfirming evidence and a corresponding "doubling down" on the part of the person being manipulated.
For example, Fear, Obligation and Guilt are classic ways that manipulators seek to control others. The person being controlled may or may not rationalize their involvement and participation. Cognitive dissonance is not necessary nor is it always involved in the process.