I was reading the comments at the link and it’s appalling the number of people who are so outraged about the delivery driver shooting and killing a dog, and claim they’d settle it by shooting and killing the delivery driver.
They clearly don’t see the hypocrisy of their position.
I wouldn't try to kill him, but I would certainly want to see him beaten very badly with a baseball bat so that he will have a month in the hospital to think about what he has done.
This does not seem like a justified shooting to me. If other facts come out that changes the appearance of this, I will change my mind, but from what I can see right now, this doesn't look like a reasonable thing that he did.