I don’t see how “leave because a giant killer hurricane is going to hit your area” and “leave because people are breaking into your house” are even the same thing.
Of course it makes sense to run away from a giant killer hurricane. That’s an unstoppable force. To run away from intruders when you have other options - well honestly that’s going to fall somewhere between “cowardly” and “sensible” depending on the circumstances. But in the Texas case, I think the kid did exactly the right thing, as he was trained to do.
Except he needs a little more range time and practice, maybe, so he hits his target more accurately.
Somebody attempted to carjack me once, for real. Also I have had my home burglarized, once. I don’t know if my reaction was typical, but if you’ve never experienced a confrontation like that you may not know just how you’d react. I can tell you that my immediate, visceral and unpremeditated reaction was absolute and utter and pure outrage that someone would DARE to violate my space, or try to take something I WORKED for.
In the carjacking incident, I totally surprised myself by going batshit screaming insane on the guy who pulled open my passenger car door and started climbing accross the seat at me. I am a fairly small female and was not armed but my reaction was instantaneous rage, and I attacked him, screaming, nails, teeth, whatever. I lunged at him across the seat without even thinking. It didn’t occur to me to wonder if he was armed (I didn’t see a weapon, and yes I reported it) or what his intent was, or what statistics about carjackers’ intents were, or anything. I didn’t care. I just reacted.
He ran away. 
Honest and for truth had I been asked before that happened how I’d react, I don’t think I would have had a clue. I probably would have assumed I’d cower and give up whatever was asked for, and/or call teh authorities. But people, when faced with sudden intrusion and violence (I consider breaking into someone’s home a de facto violent act no matter what their intent) just react instinctively. At least I did. And quite possibly, so did this 15-year-old. And, good for him, I say.
Nunzio, have you ever been confronted in a physically violent manner?