Key elements of this claim are the rejection of any of the following: that the Nazi government had a policy of deliberately targeting Jews and people of Jewish ancestry for extermination as a people; that over five million Jews were systematically killed by the Nazis and their allies; and that genocide was carried out at extermination camps using tools of mass murder, such as gas chambers. 
Holocaust deniers do not accept the term "denial" as an appropriate description of their point of view, and use the term Holocaust revisionism instead.  Scholars, however, prefer the term "denial" to differentiate Holocaust deniers from historical revisionists, who use established historical methodologies. 
Most Holocaust denial claims imply, or openly state, that the Holocaust is a hoax arising out of a deliberate Jewish conspiracy to advance the interest of Jews at the expense of other peoples. For this reason, Holocaust denial is generally considered to be an antisemitic conspiracy theory. The methodologies of Holocaust deniers are criticized as based on a predetermined conclusion that ignores extensive historical evidence to the contrary.
Goldhagen, formerly a political science professor at Harvard, will speak on “State of Deception: The Power of Nazi Propaganda,” expanding on the theme of his first book, the international bestseller “Hitler’s Willing Executioners: Ordinary Germans and the Holocaust”(Knopf, 1996).
A son of Holocaust survivors, he is currently finishing his new book, “Worse Than War: Genocide, Eliminationism and the Ongoing Assault on Humanity.”
In a joint project with Jay Sanderson, CEO of JTN Productions in Los Angeles, the book forms the basis of a documentary probing the causes and nature of genocides around the world and what can be done to prevent future such slaughters.
The two men traveled together for six months, talking to perpetrators and victims of genocides in Rwanda, Kenya, Guatemala, Ukraine, Russia, Bosnia and Germany.
The 90-minute documentary, “Worse Than War,” is to be released in late summer and will be aired as a PBS television special early next year.
In a phone interview, Goldhagen probed one long-standing question: While ethnic, racial and tribal hatreds are as old as history, why do some turn into wars and genocides, while others don’t?
The Times says this front-page report by Nicholas Kulish about murderous attacks on Gypsies, or Roma people, in Hungary is the paper’s second-most-emailed story. As well it should be. Attacks on Gypsies recall the Holocaust, when as many as 600,000 Roma were exterminated by the Nazis.
As Isabel Fonseca and Norman Finkelsteinhave demonstrated, the Holocaust Memorial/Elie Wiesel had trouble making room for the Gypsy victims of the Holocaust. Per Finkelstein, one memorial official said the idea was "cockamamie." (In Night, Wiesel said Roma attacked his dying father in Auschwitz.) Daniel Goldhagen’s book on the Holocaust all but completely leaves out the Roma.
I have a sense Jewish official attitudes are improving (Mitchell Bard’s virtual library seems to honor the Roma experience). The Holocaust Memorial states:The fate of Roma in some ways paralleled that of the Jews.
Now when the Roma are facing pogroms and terror in eastern Europe, Jewish groups should express solidarity with their fellow-victims, and be in the forefront of condemning the violence.