In my opinion, the major reason for the use of the term "conspiracy theorist" is habit, and because the people who use it rarely stop to think of the harm that the term causes. The establishment, by its very nature, maintains guidelines of acceptable and unacceptable beliefs; calling someone a conspiracy theorist, helps to deride them, and reduce their credibility without need for recourse to evidence-based debate.Many otherwise helpful people, who seek to instruct others with a gentle sensitivity to their frame of mind, become frustrated when the person they're arguing with commits logical fallacies. In their frustration, they justify (to themselves) the use of a term with derogatory connotations to describe their "opponent." In sum, our society suffers from an endemic crisis of people not knowing how to debate without calling each other names, or even why this might be a state of harmony worth attaining.Mick West earlier suggested that it is merely a descriptive term. This point would be pertinent, if we were talking about the adjective "empiricist", but I think it misses the point in the case of "conspiracy theorist". Why? Generally people don't dissociate themselves from, or refuse to make contact with, someone deemed to be an empiricist.