If a person shoves you, you can shove back. You don’t have the right to kill him.

In a world awash with disturbing videos and images, some stand out. Over the weekend, I saw a video that’s bothered me ever since. It’s grainy, and it’s not graphic, but it’s still sickening. It’s the short video of a man shooting another man in the chest. I’m not going to embed it in the article, but if you want to see it, you can watch it on this Good Morning America report.

In a nutshell, here’s what happened. A young woman, her boyfriend (Markeis McGlockton), and their young son pulled into a handicapped parking spot at a convenience store. While the car idled, McGlockton went inside to get snacks. While inside, a 47-year-old man named Michael Drejka (who reportedly has an odd history of initiating confrontations over parking spaces) approached the car and started an argument with McGlockton’s girlfriend, Britany Jacobs.

McGlockton walked outside, saw Drejka and Jacobs arguing and pushed Drejka to the ground. While McGlockton stood a few feet away, Drejka pulled a gun and shot McGlockton in the chest. McGlockton staggered away, into the convenience store, where he died in front of his son.