You're taking leaps way too far.
Hunting is incredibly fatiguing. A million things are going through one's head. You don't have to be stupid, or drunk, or lazy, or incompetent to have a lapse in judgement with your rifle at the end of a long day's hunting. The difference between mistakes and avoiding mistakes is setting rules and protocols for yourself (e.g. TAB-K) . A rule like no gunsmithing or rifle disassembly on a hunt would be a useful, lasting legacy of this thread that could save a life and it doesn't require any insult to a fellow hunter that has passed on.
Freshly rested, with perfect lighting, in a climate controlled home workshop, without distraction, I could very well make the same type of mistake on a rifle as likely happened on this hunt. It doesn't take any pejorative term to describe potential human error. It's called an accident for a reason. In the case of a fellow hunter above, it was a terrible accident with the worst consequences. It's why we do things that introduce mechanical risks in a clean-room setting and then we certify our guns reliable by function testing before a hunt begins. Problems do happen all the time since 100% of mechanical devices can and will fail.
@Ontario Hunter you tend to insert animus and state of mind into all your suppositions on other people. It's speculative in a harmful way rather than a politely factual way. You think differently than virtually everybody which is just fine, but you then infer everyone else's state of mind based upon how your mind works which is not correct whatsoever. You have no evidence for most of what you've spouted on this thread, only speculations that start with you dismissing the reported facts, then with you creating your own theories. It's weird.