The DEA agent had shown someone that the chamber was empty just before closing the slide and stating:
"I'm the only person in this room professional enough to carry a Glock .40!" right before shooting himself in the foot.
As usual, such incidents are failures on multiple levels. That's why we have to follow every rule all the time in order to be as safe as possible (i.e. don't unload the weapon and then wave it around). In this case, there were not only failures to remove the magazine first and to keep the gun pointed in the safest possible direction at all times, but also the bad habit of pulling the trigger for absolutely no reason whatsoever, as well as poor inspections by two people of the gun's action, in which the cartridges in the magazine should have been plainly visible.
By the way, I bet the guy doesn't even remember pulling the trigger. A lot of people don't, and not all of them are lying when they claim that the gun "just went off." Such is the power of ingrained habits, in this case a bad one that is often formed in the name of safety at certain ranges and competitions. Even hickok45 of YouTube, as much as I like and respect the guy, has this rather common habit of automatically pulling the trigger after unloading a gun. His other habits and practices are good enough to have prevented negligent discharges thus far, but I think it's pretty clear that a fair portion of NDs on the whole occur as a result of it. :banghead:
I guess I'm having a hard time understanding why someone being extra safe and showing the viewers of a video that the weapon they are handling is safe, is something to get upset about.
The ones who don't understand are the ones who are rolling their eyes at what they consider excessive caution. What they fail to realize is that gun safety is far more about human nature than it is about operating guns. Sure, if you're always completely focused on handling guns and conscious about what you're doing at every step as well as the exact state of the gun, then it would be safe to pick & choose between what rules of safety to follow. If the gun is truly unloaded, then it will not kill me when I point it at my temple and pull the trigger, right?
Unfortunately, however, the plain and undeniable fact is that negligent discharges occur all too often, even by people who know how to operate guns very well, and always because there was a distraction or a lapse in concentration, which is bound to happen at some point. When it does, we revert to our habits, the most basic type of behavior involving complex motions, so the only way to remain safe is to develop good habits (and break out of bad habits) that are followed at all times without even having to think about them. This is in addition to trying one's best to remain consciously focused on safety while constantly reinforcing the good habits.
Some will say that this behavior looks ridiculous, and all I have to say to them is I hope that I'm not around the next time they have a negligent discharge. It's fun to act all cool and macho around guns until somebody gets seriously injured or killed, and there's nothing cool about that.