There's likely a lot of lessons to be learned from this story. But the story isn't finished yet, and the transpired facts remain incomplete.
Some of the lessons can also be personal. Some people may opt to leave the cover of their home's interior to protect.their property. I don't begrudge them that, or claim to know the legalities. I'm not inclined to charge outside into unknown danger unless a family member is in danger out there. Even then my approach is at least hoped and planned to be discreet from an unanticipated direction. I often observe suspicious things outside from unanticipated locations as it's already part of my MO.. JMO but I think a great deal of self defense can take place without the application of force. My best to the victim and his family. It's unfortunate he didn't remain as silent as possible in the immediate aftermath.
