Conspiracy theories, as well as most religions, are really popular. One might even say that they are addictive. People get "hooked" on them, and have hard time letting go of them once they have embraced them, no matter how much evidence is presented to them of the contrary. There is, in fact, some evidence that this is not a purely psychological phenomenon, but also in part physiological. That means that it can have an effect that changes body chemistry. If something is new and exciting, exhilarating, and extremely interesting, if something "blows your mind" as they say, that sensation may in fact be caused in part because of a rush of body chemistry. The brain may cause adrenaline, dopamine and serotonin to be produced in certain psychologically significant situations, such as hearing something that's very exciting and interesting. Some people literally get a "high" in these situations; not just metaphorically or even psychologically, but literal...