Bannafish as a statement against war? I don't think that was the entire story of what J.D. Salinger was aiming for. If I remember my own reading, and pardon me this is many years ago, I remember Seymour making a big deal out of the color "yellow" and about him talking about emotions filling him up so much that he couldn't express himself. The deal with the color yellow is something Salinger explains later, since it was the color of "physicality." He's so full of emotion and life that he cannot release that he cannot stand living. At least that's what I took from the story, and if I remember the other literary criticisms I had read, they also had thought something similar.
I'm sure what you wrote was part of the whole "Too full of life to continue living" that Seymour was inflicted with, but I don't think it was the entire story. But, once again, keep in mind that these are the opinions of a computer programmer who once read J.D. Salinger for an AP English class final paper, not someone with any sort of credentials. (Though, I did get an A and developed an ulcer in the process.)