I am not going to enter into this controversy because the ones who oppose Yom Hashoah will not change their minds and the ones who respect that day will continue to commemorate it. Just two facts to correct some of the posters: Tisha be’av and Tsom gedalyah were not just instituted by chazal, it is by the novi (tsom harevi-i, hachamishi,etc) so it is divrei nevi-im that we must observe. The aveilus from Rabbi Akiva’s talmidim started in the geonim’s times (check your halacha)and clearly, there were days that were instituted to remember catastrophes (20 sivsan is just one example). And that was quite a while after the gemoro.
But my question to the opponents is more fundamental; they keep on saying that any commemoration should have been done on tisha be’av. Fair enough. So, tell me ,dear posters, do you say the “kinos’ that were made specially for the Holocaust? I suspect that most of you do not say it- thereby proving that you really do not want ANY commemoration. And that, I think, is truly sad.