@tsarstepan,
Actually, I love war movies (specifically, escape pictures) -- they are probably my favorite genre. I love them for their creativity. I consider
Stalag 17 to be a close to perfect film in a lot of ways.
I doubt that an anti-war film like
The King of Hearts or
All Quiet on the Western Front caused any sort of isolationism -- if that was happening, it was probably already there, yes?
Right now I'm rambling, bookmarking but I definitely watch war pictures because I genuinely like them -- they can be incredible pieces of cinema, and war is, by definition, an emotionally powerful scenario. The other thing is, I'm kinda wondering what you define as war pictures. Are they only ones that show combat, e. g.
The Longest Day or
Saving Private Ryan? Or are they, possibly, ones that deal with the fallout, like
The Best Years of Our Lives or
Since You Went Away?