I wouldn’t group all Americans together. When I was in school we actually talked more about the Hiroshima bombings than 9/11. It was talked about very seriously, at length, and was very upsetting. Of course every September around the anniversary everyone was talking about 9/11. I’m from outside of Boston and I was only a kid when it happened but my dad had friends on the first plane. My friend had an uncle on one of the planes. My other friend’s brother was living in an apartment nearby and saw the towers fall right outside his window. A lot of people I know had a connection to someone who died on that day.

But I actually think the two biggest reasons 9/11 is talked about more often is because 1, it’s much more recent and many people alive today who still remember it vividly, and 2 there’s so much footage and media which is what really gets people’s attention. Theres survivors who continue to tell their stories, there’s voicemails left by people on the planes, etc. so the memory is kept alive. As opposed to something that happened 76 years ago and probably doesn’t have as many viewable up close records.

Also, just wanted to say I’m not trying to argue with you. From your comments it sounds like you and your family have experienced true hell and that should not be brushed aside or forgotten. But OP was only talking about the new documentary about the 9/11 attacks so I think that’s why that’s what everyone is taking about.