I use to help out at a pawn/gun shop that a friend owned.

I worked in the back room and many time when the owners wife was the only one out front when the owner was not There i would load a AR 15 and have it in the back room with me .
My work bench was right next to a one way mirror and i could see everything going on in the shop.
I caught a few shoplifters red handed on camera.

I have a feeling it'll happen one day soon. Only takes a second, and then...well we here know the drill.

Funny you should mention this at all and now because, at my gun range,which, like many indoor ranges, has an adjacent shop that sells some very scary looking weapons, more and more people are coming in to look at these weapons and most of them really don't seem to be...erm...all there, as in what they say and how they handle the weapons. And with its recent new addition of being able to rent and shoot the AKs and ARs I've noticed some other alarming trends, as in more very young groups of amateurs with less respect for the weapon and people around them, more waving around of weapons people are shopping for, and more cavalier attitudes in general, as if it's all a big game or something. I can't describe it well, sorry, but all I know it that it's been giving me a very uneasy feeling, so much so that I've found myself going there less and less over the past few months. Sigh.

Just this year there was a guy at an Indiana gun shop who rented a gun, shot 50 rounds on the range, came back out and shot the clerk. The clerk, (being armed himself) killed the guy without any other loss of life. After the clerk got out of the hospital, the store owner told him he had a job there for life. Or at least, as long as they were still in business.

In another matter, at my gun range, the clerk had no reluctance letting a dude with a neck tattoo check out a few pistols. I guess that's the price you pay with 'freedom for all'. Obviously, you cannot deny him his rights because of that. But people with judgement THAT bad definitely wouldn't make a responsible gun owner IMO. That's where I would draw the line if it was up to me.

People shoot themselves and other people at gun ranges fairly often but, if your looking for a crowd of people it is not going to be on the top of your list and also people tend to have some sort of tie to the places the shoot up.

Cars do not go out of their way to find and kill other motorists. Volcanoes do not go out of their way to kill the stupid people who built homes on its sides. Tsunamis do not go out of their way to find vulnerable areas to flood and kill the thousands of people who live there. Storms an tornadoes do not go out of their way to find unsuspecting people to kill. Bombs dropped by military do not go out of their way to find innocent bystanders to blow to smithereens. Nuclear bombs do not look for innocent people to vaporize. Animals do not go out of their way to find humans to kill or eat. Mountains do not call climbers to come to die on its slopes. Oceans do not go out of their way to find stupid sailors to drown nor do they set sharks upon those who fall in the ocean to be eaten - surfers go out of their way to find the biggest wave to commit hari kiri upon. Guns and rifles to not search out people to shoot and kill.
In all these instances stupid people build in places they shouldn't, go places they shouldn't, explore places they shouldn't, stay in villages that will be blown apart, join militias they shouldn't, drive drunk, drive to fast, become criminals, murder ex-lovers, kill their bosses, go postal.
Admittedly children in a school did nothing to bring tragedy their way other than being in the same place where some nut job would go postal and shoot anyone moving within his/her sight. The people in the World Trade Center did nothing to bring disaster their way.
You have to admit that there are money hungry, power hungry, media hungry, egoists who don't care about anything or anyone but themselves - innocent people are their cannon fodder.
Bankers who rob and pilfer through schemes are no different from shooters. How many people have died from having no home, no money for food, no opportunity for a job.
Dictators, Premiers, Presidents and politicians fall into the same category of predators looking for prey.
Why have't there been very many mass killings of politicians, Presidents, Premiers and Dictators? Because these people in power have the means to make life miserable not only for you but also for your entire family.
Maybe we should ban everything that kills people - cancer, diabetes, heart conditions, food poisoning, snake venom and so on the list goes.
Why not ban God since he seems to kill millions of people every year and trillions over a lifetime. What a joke Jehovah is, the same for Allah and Muhammad, Jesus is a barrel of laughs on the innocent. Churches or Religions are part of those same jokes on humanity Lets kill everyone in the name of your God. Lets send everyone to heaven or hell - neither of which exist except in the mind of the believer.
God exists with or without me - it takes no faith in God from me for God to exist. Trees exist whether I am alive or dead - can a tree have faith that it exists or that God exists.
Tomorrow - 12/21/12 - nothing will happen because I say it won't. I will not allow my existence to be shortened by anything other than the way I know I will die. I will not die because the world went spinning off into space, because the earth shakes, quakes, rattles and rolls. If space aliens show up on the White house lawn I will greet them as brothers and sisters whether they are blue, pink or wrinkled skin.
Why - because God created all the worlds, all the universes, all the methods of death and life. There is no blame because it is just a fact. Period!

You are not helping your case any by referencing such an article.

my case? I am not even for gun control, I was merely commenting an incident as per the topic asked.