We've been told umpteen times that if a dirtbag already has a weapon trained on you that if you attempt to draw your own, you will only get shot.
All kidding aside, good for the pizza delivery driver, he saw a threat, he warned the 2 dirtbags, they didn't heed the warning, he drew his legally carried gun and shot in self defense.
Bottom line, if you don't want to get shot committing crimes, don't commit crimes. Seems simple enough to me.

and one that isn't mentioned in the story is that even though the pizza guy was licensed to carry a gun he will probably be fired. Many if not all employers forbid employees from carrying a gun while working. I drove a cab for some time after retiring from the AF and they told us not to carry. All of the drivers carried anyway but if you got caught or had to shoot someone they would fire you. I hope this isn't the case but it is often true. I'll have to keep an eye out for a followup story.

I carried too, when I delivered pizza. Thankfully, never needed it.