Any casual observer of history knows that reading/watching content about war is nothing like the reality.
English poets today don't write how war is great for the spirit or whatever...
Sure, there's still plenty who don't quite get how bad armed conflict actually is.. but it's less romanticized today.
Reading wikipedia it seems when the book came out it was critically received by some for "it's pacifists agenda".
Sure, we still glorify warfare, but our culture and tolerance for casualties have changed dramatically.