Gilead Atmon has a long article in Counterpunch about the psychology and culture of Jewishness. It’s interesting even if too convoluted. Basically he says that “jewishness” is a form of neurosis.
Being a neurosis (of a particular sort) it would follow that those who suffer from it should manifest the same general symptoms and act in similar ways. Not surprisingly this in turn gives rise to conspiracy theories, which incorrectly ascribe an intent to what is merely a symptomatic pattern. That said, it must also be said that since the emergence of Zionism, the "conspiracy" of symptoms has been accompanied by a parallel and actual conspiracy of actions aimed at realizing the devoted object of the neurosis.