At least WWII, unlike those preceding it, has a vast well of literature to draw those lessons from. The trouble, however, is not just getting younger people to sit, read and analyze it, but also to separate the wheat from the chaff, so to speak, with all the propaganda and misinformation to be had these days about the events of WWII, the Holocaust, Hiroshima/Nagasaki and so many other things that would make this list exceptionally long.
Books, are not the same as having lived it, of course. Aleksandr Solzhenitsyn put it best in The Gulag Archipelago.
“If it were possible for any nation to fathom another people's bitter experience through a book, how much easier its future fate would become and how many calamities and mistakes it could avoid. But it is very difficult. There always is this fallacious belief: 'It would not be the same here; here such things are impossible.'
Alas, all the evil of the twentieth century is possible everywhere on earth.”
I'm curious as to what sort of propaganda or misinformation you're referring to. I'm in Europe and I haven't seen much of it, but maybe it's different in the US.