For all I know, this guy could have been an otherwise very responsible and conscientious firearms instructor, and if that was the case, it drives home the point even more emphatically that one momentary lapse of common sense or discretion can bear tragic fruit.
Unfortunately, those of us practitioners and advocates of the 2nd Amendment have to deal with a few morons on our side who post videos of their 95 lb girlfriends shooting a Desert Eagle, or their 12 year old kid shooting a .460 Weatherby, just for chuckles. There are likewise the chest beaters who will ridicule others' choices of defensive weapon as inadequate or, "mouse guns." Some people can only handle so much weapon, and if nothing else, this story should be a lucid illustration of that point.
Yep.