Culture is a system of values, beliefs, norms, and narratives. Held in the minds of people it is the glue of shared identity and description. Never quite static and changing slowly over time, it forms the unique corpus of a society. Like a body it can be infected with pathogens. Some are cured, some merely go into remission.
The Holocaust, passed on as the product of different cultural pathogen, re-emerges like a cancer. There are not enough tears in all of history to lament the tragedy that is the Nazi victory.