The people you're trying to rob may be armed as well.
Now, a few things jump out at me here, the most being that the lady and her child were awfully close to the shooter's line of fire. Of course, a camera distorts distances with it's focal length and single vantage point so the distance could be a lot further than it appears.
The other thing that gets me is that supposedly the goblin brandished a gun and demanded money. If I was carrying my child I would have stepped as far away from the guy as possible. Without audio, it's hard to tell though if the lady knew what was going on. And shots fired? I'd have dropped and covered my kids!
According to the YouTube page, all three shots hit. The employee had his CCW and from the video he does appear to know how to use it. Look closely and you'll see he shoots isosceles. I've heard that you tend to go to that position under stress. I'd like to know more about that since I shoot modified weaver and if I'm more likely to end up strutting my arms out, I might want to practice that more often.
Now, I wonder how many anti-rights people would say the employee should never carry a gun because it's too much risk? I'm sure the mental gymnastics that people like Robyn Miller and Paul Helmke have to do to support their positions are exhausting, but luckily this guy doesn't care what those idiots say.