WTP: “Lilmod, you missed the strongest argument about Yom Hashoa- it’s official full name is Yom Hashoa V’hagvura, meaning they are commemorating the bravery and might of the victims, hence the choice of the Warsaw uprising as the date.”
WTP – thank you for that clarification. I know of a few other reasons, but I forgot (or didn’t know) that reason.
One big reason was the fact that all major tragedies since the Churban are connected to the Churban and supposed to be commemorated on Tisha B’Av in order to emphasize the connection. The Gedolim felt that the secularists were deliberately trying to place the holocaust in its own category and disconnect it from the Churban.
I hadn’t mentioned that in my previous post because it wasn’t directly connected to the topic at hand. Your comment is, however.
There was an article in the Jewish Observer in 1977 (and no, I didn’t read it in 1977 in case anyone is trying to figure out how old I am) with a translation of a speech by Rav Hutner, zatsal explaining the problems with Yom HaShoah. If anyone is interested, you can find it online derech Google.