Your personal constitution
If you are a military member with the correct mentality knowing that sometime, somewhere you wrote a blank check to the US Government that said you would defend your country and possibly they might cash that check with your life, then I don't quite understand the toil and discussion on whether or not to own a gun and whether or not to use deadly force. If a person enters your home under any circumstance where they were not invited, then your only ascertainment is that they assumed the risk that they may be making the very same sacrifice you are willing to make to your country but they are simply making it for personal gain by taking from you. That same calculation can lead you to believe that since they entered your home with this knowledge, then they are fully prepared to do what they have to in order to preserve their life and have no reserve for yours. That makes it very easy for me to act in order to protect my life, my family and my sense of security in my own private home. And when articulated as such, assuming I have executed this severe act of engagement only to accomplish the protection of my home, rights and property, there is not a court in the land of the free that will take that right away from you. Every law in every state is different, but when it all comes down the primitive nature of what the person was doing in someone else's home or your home, it is rare, if ever, that a person's right to defend themself is ever denied, almost as written in the rules of engagement, "the right to self defense is never denied." The more knowledge you have the better, you must seek continued knowledge and education but understand that the root concept is simple.
There are countless factors involved with protecting yourself, family and home with any kind of weapon. Do you blindly shoot? Do you use escalation of force through verbal commands and try to de-escalate the situation once you have their attention? How many of them are there? What time of day is it? Can you positively identify the person you shot? How many did you shoot? Why did you shoot them 7 times? Why did you shoot them 12 times? Why did you shoot them 15 times? Why did you reload and shoot them 5 more times? Did you feel your life was in danger? Were they armed? Why didn't you shoot? Why didn't you call 911? Did you call 911? What is the average response time to your home? What is the frequency of violent crime in your immediate home area? What is the frequency of violent crime in areas similar to yours? What is the perception of known criminals that view your areas and people like you? What did they break into your house for? Are they homeless? Are they drug addicts? Are they rich people looking for a thrill?
Who cares? The bottom line is this: Someone taught them or tried to teach them right from wrong. Somewhere, sometime they decided that making an honest living wasn't for them and they were going to gamble with the fact that they could possibly lose their life by violating another life. They are willing to accept the risk, I think it is only fair that you produce that risk by arming yourself and being prepared to protect yourself, family, property, an honest way of life, and prevent someone at the root, instead of feeling violated and wondering what could you have done better in that instance. If they are lucky enough to live through an encounter as such, maybe they will learn that it is not right to invade someone's home and so easily acquire wants and toys and money for themselves and maybe point them toward an honest living filled with reward and a feeling of good in their heart. That is, if they are lucky enough to live. If someone breaks into my home, they will be shot if I or my wife are home. When I have children and they are old enough and responsible enough, they will shoot home invaders too.
I fully understand that not everyone is comfortable with the use of deadly force and/or guns. If that is the case, by all means, take the other appropriate steps necessary to protect your home, yourself and family. That is the absolute best that the righteous can ask in order to teach those, who willfully and wrongfully take, a lesson.