We should NEVER stop teaching about the Holocaust or any genocide. When we stop telling our children about them and warning them about the consequences of rampant hate and racism, then we welcome these things to happen again. The Medz Yeghern, the Holocaust, Bosnia, Darfur and Rwanda and every other mass murder or ethnic cleansing should never be forgotten. And I hope that in the far future we will still look back on the 20th and 21st centuries and feel great shame as a species for the things we did to one another.
Your 'original sin' has nothing to do with it, and why should people today be punished for a mythological crime that supposedly happened thousands of years ago? If your God thinks that is just, than your God is a monster and not worthy of worship.