Doomsday cult is an expression used to describe groups who believe in Apocalypticism and Millenarianism, and can refer both to groups that prophesy catastrophe and destruction, and to those that attempt to bring it about. The expression was first used by sociologist John Lofland in his 1966 study of a group of Unification Church members in California, Doomsday Cult: A Study of Conversion, Proselytization, and Maintenance of Faith. A classic study of a group with cataclysmic predictions had previously been performed by Leon Festinger and other researchers, and was published in his book When Prophecy Fails: A Social and Psychological Study of a Modern Group that Predicted the Destruction of the World.
Referring to his study, Festinger and later other researchers have attempted to explain the commitment of members to their associated doomsday cult, even after the prophecies of their leader have turned out to be false. Festinger explained this phenomenon as part of a coping mechanism called dissonance reduction, a form of rationalization. Members often dedicate themselves with renewed vigor to the group's cause after a failed prophecy, and rationalize with explanations such as a belief that their actions forestalled the disaster, or a belief in the leader when the date for disaster is postponed.
Some researchers believe that the use of the term by the government and the news media can lead to a self-fulfilling prophecy, in which actions by authorities reinforces the apocalyptic beliefs of the group, which in turn can inspire further controversial actions. Group leaders have themselves objected to comparisons between one group and another, and parallels have been drawn between the concept of a self-fulfilling prophecy and the theory of a deviancy amplification spiral.
The term "doomsday cult" was first used in the title of a 1966 scholarly study of a group of Unification Church members by John Lofland, entitled: Doomsday Cult: A Study of Conversion, Proselytization, and Maintenance of Faith. James Richardson writes in the Encyclopedia of Religion and Society that after the publication of Lofland's work, "The term doomsday cult has become a part of everyday parlance, used by the media to refer to apocalyptic religious groups."
While a student at the University of California, Berkeley Lofland lived with Unification Church missionary Young Oon Kim and a small group of American church members and studied their activities in trying to promote their beliefs and win new members for their church. Lofland noted that most of their efforts were ineffective and that most of the people who joined did so because of personal relationships with other members, often family relationships. Though Lofland had made his sociological interests clear to Kim from the outset, when she determined that he was not going to convert to their religion he was asked to move out of their residence. Lofland published his findings in 1964 as a doctorial thesis entitled: "The World Savers: A Field Study of Cult Processes," and in 1966 in book form by Prentice-Hall. There have been several updated and expanded editions since.  It is considered to be one of the most important and widely cited studies of the process of religious conversion, and one of the first modern sociological studies of a new religious movement.
Nature of doomsday cults 
In Globalisation and the Future of Terrorism, Brynjar Lia notes that "Doomsday cults are nothing new," but also states that they are "relatively few." Lia cites the mass murder/suicide of members of Peoples Temple at Jonestown, Movement for the Restoration of the Ten Commandments of God, the use of salmonella as a poison by followers of Bhagwan Shree Rajneesh, and actions of Aum Shinrikyo as examples, noting that: "...during the past decades one has witnessed a number of increasingly violent doomsday sects, inflicting mass violence on their members and, in rare cases, also on outsiders."
In his book Nuclear Terrorism, Graham T. Allison also cites Aum Shinrikyo and the Branch Davidians as examples of doomsday cults, but notes that "..only a handful can be considered dangerous." The 9/11 Commission Report of the National Commission on Terrorist Attacks Upon the United States also referred to Aum Shinrikyo as a doomsday cult, as did an article published by the Centers for Disease Control and Prevention. In Ashes of Faith, physician Robert Bwire describes the March 17, 2000 deaths involving the Movement for the Restoration of the Ten Commandments of God as the largest of its kind in recent human history.
In Mystics and Messiahs, Jenkins writes that as a result of events between 1993 and 1997 including the Waco Siege involving the Branch Davidians, violence involving the Order of the Solar Temple, Aum Shinrikyo's sarin gas attack on the Tokyo subway, and the Heaven's Gate incident, "Reporting on so-called doomsday cults became a mainstay of the media, just as satanic cults had been a decade before." However, Jenkins regards the Order of the Solar Temple as more of an example of organized crime than a doomsday cult, and believes that there is a certain polemic surrounding use of the term itself.
In Yakuza: Japan's Criminal Underworld, the authors also make a comparison to organized crime, writing that Aum Shinrikyo "..often resembled a profit-hungry racketeering gang more than a fanatic doomsday cult." In James R. Lewis' The Order of the Solar Temple, he writes that the media made use of the term doomsday cult to characterize the movement, though former members and outsiders did not know what kind of event would occur.
In his book Politeia: Visions of the Just Society, Eric Carlton debates whether or not the term is appropriate to describe these types of groups. Carlton writes that the event is only seen as a "doomsday" for the "wicked and unrepentant," whereas members of the group itself often regard it as a "day of deliverance," or a "renewal of the world." He regards these groups as "the ultimate in exclusivity," and while the future will be bleak for nonbelievers due to an unforeseen cataclysm, members of the group are promised existence in a new utopia.
Psychological dynamics 
A psychological study by Festinger, Riecken, and Schachter found that people turned to a cataclysmic world view after they had repeatedly failed to find meaning in mainstream movements. Leon Festinger and his colleagues had observed members of the group for several months, and recorded their conversations both prior to and after a failed prophecy from their charismatic leader. The group had organized around a belief system which foretold that a majority of the Western Hemisphere would be destroyed by a cataclysmic flood on December 21, 1955. Their work was later published in the book When Prophecy Fails: A Social and Psychological Study of a Modern Group that Predicted the Destruction of the World.
Prophecies and predictions 
Social scientists have found that while some group members will leave after the date for a doomsday prediction by the leader has passed uneventfully, others actually feel their belief and commitment to the group strengthened. Often when a group's doomsday prophecies or predictions fail to come true, the group leader will simply set a new date for impending doom, or predict a different type of catastrophe on a different date. Niederhoffer and Kenner say: "When you have gone far out on a limb and so many people have followed you, and there is much "sunk cost," as economists would say, it is difficult to admit you have been wrong."
In Experiments With People: Revelations from Social Psychology, Abelson, Frey and Gregg explain this further: "..continuing to proselytize on behalf of a doomsday cult whose prophecies have been disconfirmed, although it makes little logical sense, makes plenty of psychological sense if people have already spent months proselytizing on the cult's behalf. Persevering allows them to avoid the embarrassment of how wrong they were in the first place." The common-held belief in a catastrophic event occurring on a future date can have the effect of ingraining followers with a sense of uniqueness and purpose. In addition, after a failed prophecy members may attempt to explain the outcome through rationalization and dissonance reduction.
Explanations may include stating that the group members had misinterpreted the leader's original plan, that the cataclysmic event itself had been postponed to a later date by the leader, or that the activities of the group itself had forestalled disaster. In the case of the Festinger study, when the prophecy of a cataclysmic flood was proved false, the members pronounced that their faith in God had prevented the event. They then proceeded to attempt to convert new members with renewed strength.
Effects of characterization 
Some see the use of the term itself as a self-fulfilling prophecy, where the characterization of being called a doomsday cult may actually affect the outcome of violent events related to the group. The Canadian Security Intelligence Service Report on Doomsday Religious Cults reported:
Sanctions applied by authorities are often interpreted by a movement as hostile to its existence, which reinforces their apocalyptic beliefs and leads to further withdrawal, mobilization and deviant actions, and which in turn elicits heavier sanctions by authorities. This unleashes a spiral of amplification, as each action amplifies each action, and the use of violence is facilitated as the group believes this will ultimately actualize its doomsday scenario."
Eileen Barker has compared these concepts to the notion of a deviancy amplification spiral in the media and its effects on new religious movements, and James Richardson has also discussed this effect. In the case of the Concerned Christians, use of the term "doomsday cult" as a characterization of the group served as a justification for deportation of its members by the Israeli government.
In the book The Copycat Effect: How the Media and Popular Culture Trigger the Mayhem in Tomorrow's Headlines, author Loren L. Coleman discusses the effect the media can have on the seemingly innocuous intentions of a French doomsday cult. On September 5, 2002, Arnaud Mussy told his followers based in Nantes, France to look forward to voyagers from Venus who would collect them before the end of the world on October 24, 2002. Though Mussy denied any plans for a mass suicide, both police and the media drew parallels to the Order of the Solar Temple. In Apocalpse Observed, authors Hall, Schuyler and Trinh discuss the effect the media had on the events surrounding the Order of the Solar Temple group. They note that news commentators "could not making a comparison to events in Waco, where the government siege of the Branch Davidians had just begun."
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