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Back in the 70s in New York I was on the Seventh Avenue IRT and a wild-haired and pants-stained guy sitting across from me was talking to himself. "War is hell!" he said. "War is hell! War is hell!" Then after a pause, he said, "Want to know how much of a hell war is? Well, look at ME! I'm fucking NUTS!"
You might say this is about the only legitimate "insight" that war brings, assuming you've survived it.