I wouldn't call it brainwashing....
I would be more inclined to call it warped.
But I grew up playing in bomb craters, where I recycled the remains of dead people's lives into fantasy dolls houses.
Where the soil that I scrabbled around in was contaminated with all sorts of ancient diseases and where the smell of stagnation and rot was more familiar to me than perfume.
Youngsters nowadays could never understand the significance of staring at half a child's bedroom, dangling, with tattered curtains still flapping in the wind.
Still less will they understand that children growing up in such a scenario think of it as totally normal and that they presume, when their mother says "It was a World War, darling!", that the squalid scene that they live in is the same all over the entire planet.
War is not just a racket, it is a creator of warriors.
Warriors who would rather die defending against it than see it happen to any other child again.
The book "War is a Racket" is only 13 pages long and is here in pdf form:
https://ratical.org/ratville/CAH/warisaracket.html