Killing/executing someone over stuff doesn't sit well with me, life is not a video game.
Locally a citizen was home and heard his vehicle start up outside in his driveway. He was a more alert individual and grabbed a conveniently placed handgun and went outside to see what was going on. Someone was behind the wheel of the vehicle, he showed that individual he was armed. The guy put the vehicle in reverse and proceeded to back down the driveway. Our hero yelled "Stop or I'll fire." The guy in the car, went to drive and attempted to speed away while probably flipping our hero off out the back window. Our hero fired one shot, one shot that changed his life forever. He was not extremely well trained but that one shot caught the perp in the back of the skull and ended him instantly, the vehicle went aways and crashed into a parked car. Our hero was arrested, had his day in court where he was acquitted although in the process lost his job that he could not attend while incarcerated, lost his house and if I remember correctly lost his wife who could not get behind killing someone over a car. Some people are not thinking about the outcome when they react or overreact to a situation.
My quick tempered, well armed son was in my house three years ago. We were talking in the living room when I see him draw his concealed firearm and say "Dad, there is someone in your backyard." I said "Put that *******ed thing away, that's my lawn care guy spraying my lawn." I told him that if he ever pulled a firearm in my house again that will be the last time you'll be welcomed.