Holocaust survivors are still with us, but the kind of nationalism that put them through that ordeal is on the rise again and is gaining popularity with teenagers.
Technology could help, but right now it seems to be working the other way.
I don’t have a problem with the kind of nationalism that gave European minority languages pride in their own culture and literature in the 19th century, for example.
I do have a problem with the kind of nationalism exemplified by lots of 20th century European leaders from Kaiser Wilhelm II to Milosevic.
The latter kind is sadly on the rise again. And the former isn’t endemic to nationalism. Everyone can have pride in their identity, it doesn’t need a state apparatus.
Well, you'd want to think so. But I wonder if all identities politics doesn't, in the end, trend towards fascism.
If history does teach us anything, the moral ambiguity of technological progress is surely one of the lessons of the 20th century. I think it might be one of those lessons we're forgetting again after a couple generations!
H-bombs as a much more expensive version that is arguable thanks to the somewhat lasting peace they can be argued to have brought through MAD, but if it had turned out world enders were something anyone could easily throw together it would be a very different world, or non-world.