This question asked in this thread in General Questions could not be answered, as none of the participants could agree on the definition of a cult, or indeed whether they exist or not. So I thought we’d move the party over here. Here is a very interesting previous debate on the topic.
Some people seem to run around tagging every religion they disagree with (or misunderstand) as a cult. Others say that the line between a cult and a sect/religion is so thin, if not non-existant, that there is no sense in defining a cult- any organized religion or belief in a higher power fits the criteria.
I believe that “cults” distinct from religions/sects certainly exist, and it is important to define and identify these organizations and their techniques because they can be terribly harmful to people in very concrete ways. Where the majority of organized religions can bring positive benefits to their follower’s individual lives by providing a supportive social structure and/or a framework in which they can express their faith, cults can only support the ones in power.
I also feel that we are all a bit blinded by religion when discussing cults. There exists psychological, political, and economical cults that have no spiritual beliefs or overtones at all. Perhaps using a term such as “cultic organization” instead of the word “cult”, which functions as both a value judgement and a valid religious definition (cult of the cave bear and all that), would help keep that in mind.