I think you're proving his point. He's not saying that people don't make mistakes--they do. He didn't say that people aren't the cause of AD's--they are. Although OT is capable off speaking for himself, the philosophy he mentioned is that a person is responsible for handling a gun in a safe manner. The deliberate act of not putting your finger on the trigger until you're ready and have decided to shoot substantially cuts down on AD's and ND's.