Often, when polling is done about fringe beliefs, conspiracy theories and the like, the results given are very disturbing. Examples of fringe beliefs being 9/11 being an inside job, or that the Holocaust was fake or exaggerated.
Do we know how reliable polling about the topic is?
For example, do trivial changes in the wording of questions make a major difference in poll results? Also, are people more likely to say that they agree with a conspiracy theory when the sole purpose of a poll is to measure the extent of belief in that theory?