Definition of Holocaust
The Holocaust was the state-sponsored, systematic persecution and annihilation of European Jewry by Nazi Germany and its collaborators, between 1933-1945.
Why Would You Deny The Holocaust?
The denial of the holocaust is generally Nazi based or anyone who had anything to do with it. Some of of these people (Nazi or Nazi descent) deny it because they were trained to deny the mass killing of these people or just don't want to remember themselves murdering these people (the guilt). Some are just don't like the Jews and deny it so they a excuse to call them liars, and others just agree and are influenced by these other people.