Are there certain people more likely to deny the Holocaust?

All kinds of people deny the Holocaust, presidents, bishops, and even survivors, everyone has their reason. Typically people from the extreme Left and Right state that there were only about 200,000 Jewish deaths during the Holocaust. Most believe it was only a result of the prosecution that happens everywhere and everyday to groups such as: homosexuals, communists, and mentally disabled. British Bishop Richard Williamson expresses his beliefs that the Holocaust is “lies, lies, lies”. Iranian President Mahmoud Ahmadinejad, perhaps one of the more well-known deniers, calls the Holocaust a “myth” and explains that Jews were the ones to invent it. Frenchman Paul Rassinier was caught attempting to smuggle Jews to Switzerland during the Holocaust and taken to the Buchenwald and Dora concentration camp. He managed to survive the perils caused by the Nazis, and was freed when his camp was liberated. Even through his experience in a camp, he claims that the image created of the concentration camps was false, along with the witnesses and the documents. Defending the Nazis, Rassiner announced, “...never at any moment did the responsible authorities of the Third Reich intend to order — or, in fact, order — the extermination of the Jews in this or any other manner."