A lot of armed citizens think they do.
The Truth?
The Truth is that just Think they do.
Too many citizens thank that Castle and SYG give them carte blanche to start shooting when a confrontation kicks off. You hear comments like "I'll just anybody I find in my home who doesn't belong there" or my favorite "I don't need a lawyer, a good shoot is a good shoot, and the law says so".
And there's no better belief system like that to get you either locked up with all the people you're worried about, or else watching your Life savings go into your legal defense, or just out the window in legal suits. There's more to self defense or personal protection than just wining an armed confrontation.
The two article links below were written by Massad Ayoob. An Ex-cop who now spends more time giving seminars on the legalities of self defense, and testifying as an expert witness for people who thought they were just defending themselves, but instead wound up dealing with the criminal justice system.
Now a quick caveat here. A lot of Self Defense instructors who main source of income comes from teaching shooting classes will denigrate Massad Ayoob as being a guy who, if you listen to him, you will wind up getting killed while you try to dial your lawyer in the middle of a gunfight. To those types of "Self Defense Instructors" , all I can say is that they won't coming down the road to help pay your legal expenses. They won't come to court to testify as expert witnesses on your behalf. And a good many of them will actually say something along the lines of "Well I never told him to do that" in order to keep themselves out of Civil suit.
So just remember, if bad luck in the form of a home invasion/burglary or a street confrontation comes your way, in modern society, personal protection doesn't end when the physical fight does.
https://www.personaldefenseworld.com/2016/02/massad-ayoob-understanding-stand-your-ground-castle-doctrine/?preview=true#massad-ayoob-stand-your-ground-castle-doctrine-6
https://www.personaldefenseworld.com/2014/12/castle-doctrine-facts-vs-fiction/