I do not think that necessarily relies on cognitive dissonance.<p>For example, there are plenty of example you can point to of an American conspiracy to overthrow governments, but it is not not cognitive dissonance to believe that a particular American was not involved in it.<p>The only reason that this logic does not apply to Jews is that their is no central hierarchy to Judaism, however it is still possible to believe that there is a shadow organization that is running the world and happens to be Jewish.