Holocaust denial is one of those quaint-at-best, pathetic-at-worst fringe views that most rational beings view with a mixture of contempt and pity. Holocaust deniers (or "revisionists" as they like to delude themselves) believe that everything, from video footage of Auschwitz survivors to the ruins of the compounds everywhere from Breslau to Berlin, was either staged or faked. These are the same ignorant bigots who masturbate while reading passages from Mein Kampf and The Protocols of the Elders of Zion while spewing filth about the "Jewish conspiracy" to control every aspect of modern life from our financial institutions to our government.
It takes a special kind of hatred to not only disaffect oneself with the fact that six million men, women, and children were gassed in concentration camps for no reason other than their Jewish heritage, but also to pretend it never happened and portray the atrocity as a staged performance to garner pity for the Jews. It is, for lack of better words, disgusting.
I'm not Jewish, by the way; it just angers me that people can still be racist and hateful in these enlightened times...In the European Union Holocaust denial is a crime, here in the States it's protected as free speech.