I don't believe cognitive dissonance is the driving force for discovery.
You are confusing a force with a particular condition.
The force behind cognitive dissonance is the force for discovery.
The force behind cognitive dissonance is the need for orientation/curiosity/play/seeking behavior.
Organisms have food/needs/hunger centered around their visceral system. Organisms have a need for control and action which resides in the muscular or motor system. Organisms have a need for safety through planning and decision making which is the function of the nervous system. And organisms need information with which to orient itself - sensory system.
When you are faced with conflicing orientational signals you have difficulty processing the data and arriving at a decision or direction. The ancients called this double minded.
The problem is when a cult creates a time pressure where you feel you must decide right now - that there are grave consequences if you don't "make up your mind" make a decision. In addition the cult will take over your source of information and severely limit other external sources. Under this pressure the cult develops a sense of urgency. When you feel urgency you crave external help. The cult is all too willing to show you the way.
Normally the driving force of curiosity/orientation/seeking will continue to scan the environment until a resolution based on fact or reality becomes clear. Curiosity is similar to playfulness. Curiosity is insensitive to time. It is child like and will take however much time is needed.
Cults, dogma, cheap philosophy and psychology try to inhibit this natural playfulness.
This is why cults emanate from a hierarchically organized position similar to a parent. Authoritarianism.