I’d also posit that part of that poll result has to do with the cultural diffusion that has gone on with time, as every generation is further away from the reality of the Holocaust due not only to generational die-off but also lack of proper education. I mentioned this the other night, but when I was in high school in the late-90s/early-00s, more time was spent obsessing about events 100+ years ago than there was within the past century. We’d spend weeks being immersed in the Colonial Period, the Revolutionary War, the Civil War, and then a few days spent towards the end of the semester on all the events between 1890 and 2000. I learned more about the horrors of WWII by watching Saving Private Ryan than I did in the last days of my senior-level US/VA history class.