The only word first introduced at the Nuremberg trials was the word 'genocide'. Genos--people, cide--death
In the years immediately after World War II, Yiddish-speaking Jews and survivors of Nazi persecution called the murder of the Jews the ?urban (“Destruction”), the same word used to denote the destruction of the First Temple in Jerusalem by the Babylonians in 586 BCE and the destruction of the Second Temple by the Romans in 70 CE.

In Israel and France, Sho?ah, a biblical Hebrew word meaning “catastrophe,” became the preferred term for the event, largely in response to director Claude Lanzmann’s influential nine-and-a-half-hour 1985 motion picture documentary of the same name. The term Sho?ah is also preferred by speakers of Hebrew and those wishing to be more particular about the Jewish experience or who are uncomfortable with the religious connotations of the word Holocaust.

In the US many liberals say "this is not who we are". Historically we have been anti-immigrant and murderous to other races. This is who we have been and in many cases, this is who we are.