And with nine or ten men per Fort, that adds up to a staggering number of lives. Not to mention thats just one type of plane; there was a lot of other bombers over Europe and in the Pacific.
I always wondered why more crewmen didn't simply bail out once their aircraft was going down. The answer was, they couldn't get out.
Not every man who was on the shot down bombers was killed and not all the bombers made it back with all crewmen alive.