Sheesh, what a mess when someone has a legitimate concern that the use of deadly force in self defense could result in legal problems. I'm somewhere in the middle of the bell curve of the guys who seem to feel they need well-placed firearms all about the house, car, boat, whatever, for self-defense and those who don't believe it's justified. I've used firearms for about 55 of my 60 years. I've even had an "uncle" who thought it necessary to see that I knew how to commit very violent acts with all sorts of weapons up to (seriously) small nukes. There isn't anything I have that I would consider the loss worth taking a life. However, if I believed the life of any of my family or even my neighbor two doors away was really threatened, then I would use any means available to remove that threat (knives, hammers, bats, firearms). If I were giving up 20-40 years to the bad guy, then close encounter weapons would be the last consideration.
The guy who wants to turn his house into Fort Apache, repleat with claymores, concertina, and shooting pits really doesn't worry me. I can avoid him. The folks who don't believe that I have the right to defend myself in life-threatening situations plain worry the heck out of me.