I tend to be hyper sensitive about these things having been a range officer and having firearms discharged in close proximity on a retail sales floor with one being a accidental discharge and a slam fire and the other a negligent discharge where someone was not paying attention. In a third incident an instructor shot himself in the leg. All three of these incidents were seasoned gun guys, so it does happen.
When people get to comfortable with guns it can be a problem and not all guns operate the same, so it is important that one never forget what these things are. I have something like six or seven holstered handguns here that I use for carry and for shooting, everyone is loaded and ready to go and they never come out of their holsters in the home unless I have a good reason and do not handle them other than to put one on.
Looks like this gentlemen was very lucky and should heal up in time, and if the post is a learning tool than that is o.k as well. I used to love guns when I was a kid and have had hundreds of them over the years, now? they are tools and while I still enjoy them and carry one I think I have seen enough mishaps and mistakes for my tastes. They need respect.