A significant portion of the Hasidic Jews in the US are descendants of Holocaust survivors. For example: members of the Satmar dynasty. A significant number of non-Hasidic Jews in the US are descendants of holocaust survivors who immigrated after World War 2. This includes, children of survivors, grandchildren of survivors, and great-grandchildren of survivors. I assure you, the Holocaust remains a very difficult subject for many Jewish families, including mine, and it also affects a lot of Jewish families who weren't directly affected.
"Never Shall I Forget" by Elie Wiesel
Never shall I forget that night, the first night in camp, that turned my life into one long night seven times sealed.
Never shall I forget that smoke.
Never shall I forget the small faces of the children whose bodies I saw transformed into smoke under a silent sky.
Never shall I forget those flames that consumed my faith for ever.
Never shall I forget the nocturnal silence that deprived me for all eternity of the desire to live.
Never shall I forget those moments that murdered my God and my soul and turned my dreams to ashes.
Never shall I forget those things, even were I condemned to live as long as God Himself.
Never.
[1] https://en.wikipedia.org/wiki/Satmar [2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6720013/