There is a big differnce between The Churban Bais Hamigdosh, The Spanish Expulsion, Chelmiski and the Holocaust.
The diffence is nobody rembers or knows anyone who was a victim of the former tradgeties, but most people know survivors of the Holocaust and there are picures as well.
When you say something every day it unfortuantly gets Jaded. If we leave one day a year to remember, It becomes somehing more thought about.