Although we obviously are not aware of all the details, I guess you have to feel some sympathy for the guy knowing that he has killed some-one as this will be an awful thing he will have to carry around with him for the rest of his life. That said, the level of negligence and lax safety protocols beggars belief and a young woman has tragically and needlessly lost her life. Surely, with the possibility of live rounds being involved then every weapon should be checked at every stage before use-ie not just the armourer but the director before he handed it to Balwin and then the actor himself. The armourer clearly didn't do her job but then why would you just take their word for it? Maybe this attitude is just all another part of the American gun culture...