I don’t think that the people who collaborated with the Nazi’s in their quest to kill all European Jews (I don’t mean literally of course — I’m talking about those Zionist leaders who didn’t want to pay to “absorb religious Jewry” in striking a deal with the Nazi’s) should decide on a day to commemorate those murdered in the Holocaust.
I also think that Tisha B’Av would be fitting to be the set date, being that The Great War (later known as WWI) began on Tisha B’Av. It was the aftermath of the war (precisely the Treaty of Versailles and the Weimar Republic)
that led to the rise of Hitler YM”S and the Nazi Party and eventually to the outbreak of WWII. Not to mention that thousands of Jews were killed and exiled during WWI.
The “Final Solution” was signed on Erev Tisha B’Av 1941 while the first trainload deportation from the Warsaw Ghetto to the Treblinka death camp occured on Tisha B’Av 1942.
Talking about the Holocaust: The Witness to History is a book I truly recommend. It is a true commemorative compilation that will serve as a memorial and remembrance of the genocide and persecution of the Jews in the hands of the Nazi’s.