Some people think treating the 4 rules as absolute and inviolate goes too far and isn't really necessary.
Some people also stick forks in electrical sockets and vote Democrat.
There's a reason for following four simple safety rules every time, all the time. There's a subtle genius to it. Any one of them alone will not likely lead to catastrophe - willfully violating several at once likely will. "Treat every weapon as loaded regardless of perceived or actual condition", in and of itself, will keep you from killing things you didn't mean to, whether people, furniture, drywall, flat screen TV's, or houseplants. If you absolutely have to be drawn down on each other for a particular training to be effective, maybe a non-gun is called for? Or better yet, maybe a "let's step back and think about this for a minute".