Well, right off the top of my head, I can think of documentaries about Civil War vets becoming dope addicts because of the morphine used in battlefield surgeries; WWI vets coming home with shell shock and gas poisonings; Viet Nam vets with all sorts of mental and drug abnormalities, and even "Gulf War Syndrome" from the first Iraq conflict. I'm sure if we looked further, we could find problems from every other war in our (and other countries') histories.
It's just never good enough for some.
The drive to focus on the negative aspects of life by some is more of an issue than war IMO.
A 1946 movie, “The Best Years of Our Lives” dramatized troubles 3 returning WW2 Vets were having. It seems that even they weren’t initially so well thought of.