Umm, no, I am not a 5 year old. Why implies that someone has already been shot because Mr. Embroidered Shirt has already waved a gun about.
Firearm safety is to prevent harm to the wrong people.
What you quoted was a suggested response to correct and instruct unsafe gun handling that hadn't yet resulted in any tragedy. Two guys were just playing show and tell. Go back and look again.
It is most certainly to prevent harm to the wrong people, their future victims. It is also the proper exercise by which we should learn from others' negligence after harm occurs and use it as a teachable moment of discussion for all rather than a mere opportunity to mock the negligent party with a non-instructional knee-jerk response that doesn't get to the root of their decision or help anyone.
Again, you don't have to adopt it, but you can't refute it's value or you would. What motivates you, Kirk? I love an argument even if just for the exercise, but do you resist this corrective and instructive approach for any real reasons I should be aware of? This is more important than role-playing on a forum so feel free to PM me if you actually have a point for me to consider. Thanks.