“… sitting ducks for German fighters and antiaircraft gunners. Tens of thousands of men perished in the sky over Europe. The entire United States Marine Corp didn’t suffer as many casualties in the War against Japan as did the airmen who flew bombers over Germany.”

So people can do almost unimaginable things when they think their ‘collective identity’ (way of live, common values, etc.) is in danger. If you examine this in detail you cannot fail to notice that while the Marines fought on a more or less stable/natural environment (the sea shore, mostly) the Airmen first put themselves in a very dangerous and unnatural situation – high up in the sky – and ONLY THEN started to fight one another…