The psychology of a large crowd inevitably sinks to the level of mob psychology. If, therefore, I have a so-called collective experience as a member of a group, it takes place on a lower level of consciousness than if I had the experience by myself alone. That is why this group experience is very much more frequent than an individual experience of transformation. It is also much easier to achieve, because the presence of so many people together exerts great suggestive force. The individual in a crowd easily becomes the victim of his own suggestibility. It is only necessary for something to happen, for instance a proposal backed by the whole crowd, and we too are all for it, even if the proposal is immoral. In the crowd one feels no responsibility, but also no fear.
-C.G. Jung. The Archetypes and the Collective Unconscious
Cosmic Flotsam 