I agree, but are you assuming the 23yo knew why there were 3 individuals dressed in black and ski-masks were breaking into his home? He likely assumed the worst and delivered a response to stop the threat.
Not stirring pot, just wondering why people think that when someone breaks in your home, there are there to do other than bad things.
I definitely think they were committing a crime but it's not necessarily time to celebrate their death.
Anyway, if anyone is interested Greg Ellifritz and Larry Lindeman have what I believe are a valuable series of articles that pertain to the subject matter.
http://www.activeresponsetraining.net/your-tactical-training-scenario-castle-doctrine
https://pointdriventraining.com/2015/12/08/in-extremis-communication-part-1/
https://pointdriventraining.com/2015/12/17/in-extremis-communication-part-2/
https://pointdriventraining.com/2015/12/24/in-extremis-communication-part-3/
https://pointdriventraining.com/2016/01/22/in-extremis-communication-part-4/
The courses by Craig Douglas and William April sound highly valuable as well. I'd be interested to hear if anyone has taken those classes from those instructors.