See Rav Eliyahu Safran's poignant reflections upon the Litivsher Yeshiva Velt.
Post-Tisha B'Av: Tears for Shavel | Everyday Jewish Living | OU Life
My Chinese friend once asked me: "How come the Holocaust is so special? After all many Chinese were brutally murdered by Japanese Imperial forces, such as the notorious 'Rape of Nanking'?"
I never answered him. The answer I would have said is:
"While the grim and ghastly statistics of human life brutally snuffed out is indeed quite comparable, the facts are that China and Chinese civilization remained intact. While the Jewish Civilization that used to be in Eastern and Central Europe was utterly destroyed."
Shalom and Regards,