This shooting is 100% unjustified in my book.
Sure, the local kids have a meaty history of being royal pains in the rear to the guy and his mom. But from the story I read, the "trespasser" just WALKED UP HIS DRIVEWAY, turned around and left!
If she had done some of the other crap kids have done to him, beating on windows and all that, THEN I could MAYBE see opening fire...but still, best to be sure of your target with a good light first?
For pete's sake, forget "crazy youthful acts!" If he's justified in shooting her for "trespassing," then this guy could have shot ME a few years ago when I was taking an old man's prescription to him about 10 o'clock one night. Seems I know the area a lot better in daylight, I thought I had the right house but didn't!
So I mosey up the driveway and get greeted my a mean-looking guard dog. A guy comes out and I ask if _____ is there. He says wrong house, and tells me how to get to where I need to be.
Sure, the girl was up to no good, but how the @#%! was this idot to KNOW that? How did he know SHE wasn't lost?