I would humbly say to all first,remember after the incident comes the trial. The trial is not in the throws of the moment,but afterwards- when there are chairs,lawyers and quarterbacks to assess not just what you did,but what the implications are for “society” as a whole.
Regardless of how you define your house or house plus yard. I suspect the issues would not revolve around theft in this case,but around a legal definition possibly of “life threatening.” At least the way the issue was presented.
Any way you slice this puppy it is messy,but that’s the problem. If someone were attacking you directly "self defense " is somewhat easier to identify. However if it is merely “life threatening” a myriad of practical questions come up. I can think of at least three ways to keep food without electricity in a flooded/contaminated environment. So was it really necessary to kill over the generator? That then becomes a why did you have to kill them issue. While there is castle doctrine etc, that almost always involves breaking in and fear of life,—going out,and stopping a theft involves many option choices,not found if someone just kicked in your bedroom door,and is coming at you.
It may not be comfortable,but I would think @wildrose gave the best advice. The rub is ok why do I have a weapon. The answer is simple to preserve your life, before (immediacy) it is taken away. As to people putting you in "life threatening "situations,that requires additional preparation and thought.
As to the absence of the police,minutes late,hours late,days late,or weeks late doesn’t really enter into it. Late is late. The question will always be what options did you have? Who knows- if it is just about blood and not the law,that dangling electric line is good,if it is about life(everyone’s including the bad guys with no judgement) this society frowns on murder for the sake of murder. Even homicide is assessed if it was justifiable or not?
The ccw box doesn’t have a ton of room in it to begin with,the 2a fight is everywhere. Judgement is critical,watch our for armchairs quarterbacks,and after the fact assessments